The decks already suggested here are very good and fast, and I would recommmend the first one. However, if you want to keep your deck similar I might go for:
55k 55k 55k 55k 55k 55k 55k 55k 55k 55k 55k 55k 55l 55l 55l 55l 55l 55l 55p 55p 55r 55r 55r 55r 58t 58t 58t 58t 58t 58t
That's pretty much the deck I used as a starter, it's pretty good for beating AI3, although don't get the impression it's better than mizzle's.
I'd definitely use his deck if you must stay Gravity, but one of these two is certainly better:
4t4 58o 58o 58o 58o 58o 58o 58o 58o 58o 58o 58o 58o 58o 58o 58o 58p 58p 590 590 590 590 590 590 591 591 591 591 591 591
5bs 5bs 5bs 5bs 5bs 5bs 5bs 5bs 5bs 5bs 5bs 5bs 5bu 5bu 5bu 5bu 5bu 5bu 5c0 5c0 5c0 5c0 5c0 5c0 5c7 5c7 5c7 5c7 5c7 5c7