I find that this combo works really well especially against some current top tier combos here is what i got

atk stadium
Beylauncher L\R used for perseus
string launcher used for all other combos
I banked slightly when i launched perseus
Perseus was launched left

Hell Kerbecs BD145 WD (1 OS/1 KO)
Gravity Perseus (3 OS/ 5 KO)

Meteo L Drago CH120 XF (1 OS/ 2 KO)
Gravity Perseus (2 OS/ 5 KO)

Gravity Perseus BD145 CS (1 OS /3 KO i think its because my CS is kinda aggro)
Gravity Perseus(6 OS/0 KO)

these are all the tests I have right now ill do more later cause i had to leave my place for now cause its really hot and no ac but besides the fact the downfall to this combo could be LLD BD145LRF it seems that fast attackers can beat it so if you like take up your own testing and post it here

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Follow me on Twitter @MahoutsukaiDomo

You must have 20 tests, plus thee results versus Gravity just prove it to be slightly inferior to it.

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You must have 20 tests, plus thee results versus Gravity just prove it to be slightly inferior to it.

The 3 Ko's GPBD145 got was because they constantly kept bouncing into each other over and over

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Follow me on Twitter @MahoutsukaiDomo

Seriously, just read this first: http://worldbeyblade.org/Thread-Posting-Test-Results

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As others said you didn't do enough tests , and you should read the link hero mentioned. I would also like to point out that Storm CH120RF would be able to KO this.