BALANCE - MSF-F Dragooon Dragooon LW160CF
MSF-F - In my use of Dragooon, I've discovered that many of my wins were from OSing the opponent's bey. It is a terrific spin stealer, so I opted to use the lightest Face Bolt to add to its stamina and increase its ability to get up to speed with an opposing bey.
Synchrom Dragooon Dragooon - Dragooon gives me a little of everything. As the only Zero-G left spin bey, it's my only option for spin steal. It also has pretty good balance, low recoil, and token smash. Basically, a jack-of-all-trades wheel. I've tried Synchrom Phoenic Dragooon and Killerken Dragooon, but I've found that Dragooon Dragooon seems to work best for me.
LW160 - If the early indicators for W145 are correct, LW160 should do the same for left spin. Since I want a bey that can outlast my opponent's I went for a track that supposedly increases spin time.
CF - In my first foray with Dragooon, I used a GCF, which proved too difficult to control and always settled into a tornado stall after one hit. I wanted something more consistent yet gave me enough velocity and stamina to outspin opponents or destabilize them. CF gave me the answer because the wide disc adds additional weight at the bottom and prevents toppling over with the heavy synchrom and tall track.

ATTACK - MSF Phoenic Phoenic S130RF
MSF - I would've used an MSF-H, but I was loath to open another one I had stashed, so I used an MSF instead. Phoenic has laughable stamina, so I didn't bother. Get a heavy Face Bolt and just go for muscle.
Synchrom Phoenic Phoenic - Phoenic is still the best attack wheel in Zero-G and delivers the most impressive smash of all chrome wheels. I completely enjoy the way it performs but I might not have discovered its true potential yet.
S130 - As much as I liked the cookie-cutter BD145RF for this, Kei was right in saying that there's no real synergy between Phoenic and BD145. Instead, I opted for a lower track with a little bit of BD145 disc action going on.
RF - The important thing about Phoenic is that it keeps attacking. RF, despite its lower velocity, gives you just that -- constant attacks. If you launch it hard enough, it'll do the job early enough and not suffer from the severe deceleration that RF goes through after impact.

DEFENSE - MSF-H Killerken Killerken BD145CS
MSF-H - I wanted to build a tank bey, so the heaviest Face Bolt is a no-brainer.
Synchrom Killerken Killerken - I hate Revizer because it has incredibly bad balance and the smooth edges do absolutely nothing. It's just heavy. Killerken, on the other hand, has ridges along its side and has decent weight. When synchromed, it behaves in a manner similar to Death. It has more smash than Dragooon, and is basically -- to use someone's term -- a big bus full of fat people ... but the fat people are carrying machine guns.
BD145 - If you're building a tank, you give it tank tracks.
CS - Because I wanted a Defense bey, and not an anti-attack bey (there's a difference), CS was the only choice. CS makes the entire bey like a Soft Master, flowing with impact. Much of the opponent's smash is dissipated by CS's adaptive nature. It also has pretty good stamina.

Because I was testing three beys, you'll indulge me in that I didn't test exhaustively against the Competitive list. Instead, I picked out a few which have made a mark in our meta. All tests were conducted in a BB-10 Attack Type Stadium (Pegasis Leone Vs Set ver.), using an L/R Beylauncher. Attack type launched second, with alternating launches vs. other attack types. Combos tested against were taken from the Competitive Metal Fight Beyblades Combos thread.

MSF-F Dragooon Dragooon LW160CF
I think I made the right choice here in terms of track and tip. I really think CF makes a big difference in terms of early destabilization (attack mode) and subsequently outspinning an opponent (stamina mode). No other tip provides the stability and speed that CF gives. I like this combo a lot and will probably find its way into my tournament set.

MSF Phoenic Phoenic S130RF
I'm still frustrated that I haven't quite found the right complement for Phoenic. The Phoenic synchrom has such terrific smash that I know I can make use of it, but I'm still searching for the right combination. As it is, it's still a pretty good choice of bey because with some luck, no matter what your opponent is, you will have a chance to win because of pure smash. The results are okay for me, but I won't be satisfied until I've come up with an Attack combo that can beat anti-Attack, too.

MSF-H Killerken Killerken BD145CS
This was the surprise MVP for me in the tests. It was my least favorite combo, but it did surprisingly well. Let me say it now ... Killerken Killerken is Zero-G generation's Death wheel. I love it and unlike Phoenic, Killerken and BD145 actually work well together because Killerken doesn't need to deliver smash.

Overall, I think I'm starting to settle on to a few wheels for my competitive combos. I always try to surprise our meta with new combos out of the competitive list, and I'm pretty confident with these. I hope you guys can do some tests yourselves so we can have more data. If I have time, I would do more tests against Flash, Variares, Blitz, and even Death, but my Death wheel is presently in the possession of someone else. :p

MSF-H Killerken Killerken BD145CS vs MF-H Flash Orion S130R2F
Win: 14
Lose: 6
70% WIN RATE
Notes: Flash got some pretty impressive stadium KOs, but overall it needs to hit that big smash attack or just lose because of inferior balance. The Killerken combo is a pretty safe bet against a Flash attacker, which probably means it's a good choice against almost any attacker.

MSF-H Killerken Dragooon BD145RDF vs MF-H Flash Orion S130R2F
Win: 19
Lose: 1
95% WIN RATE
Notes: If Flash had a hard time against the previous combo, left spin and an RDF tip made it almost impossible for Flash to KO, getting lucky with one hit and sending it out of the stadium but otherwise completely outclassed.

MSF-H Killerken Dragooon BD145RDF vs Duo Cancer 230SD
Win: 4
Lose: 16
20% WIN RATE
Notes: Out of curiosity, I wanted to test this combo's ability to take on a stamina bey. In particular, Duo 230, which is dominant in our meta. As I suspected, it fared rather poorly, getting a couple of destabilizations, but otherwise outclassed. As far as combos go, I would prefer to go with my right spin dual Killerken with a CS tip, which works well both for defense and yet fares rather well against stamina. The replacement of Dragooon removes the synchrom's spin-eating ability and the RDF tip just doesn't have any stamina.

MSF-H Killerken Killerken BD145CS vs MF-H Basalt Kerbecs BD145CS
Win: 19
Lose: 1
95% WIN RATE
Notes: Just like I thought.