Thoughts on These Three Combos?

Note: I have only recently regained interest in Beyblade ever since I last played as a child, thus I have not been able to acquire any Metal Fight Beyblades, these combos have been made by reading through wikis and reviews of each part.

So yeah, thoughts on these Limited Format Combos? Any suggestions on how to improve them?

Attack: MF:H Screw Horogium 90 RSF/SF/MF (I'm on the wall between these three tips, from fight videos I prefer the movement of Semi Flat tips but if you guys know any better tips feel free to give suggestions)

Defense: MF:H Earth Kerbecs/Bull TR145/C145 MB/CS (Again, on the wall with these. Metal Ball gives it a lower center of gravity but is knocked over easily while Coated Sharp can be a bit erratic and can lose stamina more)

Stamina: Burn Kerbecs/Bull B:D
Most of these are definitely top-tier, if you refer to this recent list of competitive combinations in the Limited format:
https://worldbeyblade.org/Thread-MFB-Lim...pid1344593


Otherwise, I encourage you to post in the "Build me a combo!" topic to get advice on how to improve them.