MTT Bubble push from SB helppppppp

[CTKid]

The sunday GP on Pokerroom, down to 45 players w/ top 40 paid. Blinds 500/1000, 9 handed, I have 7k. I have been stealing/winning the blinds with an all-in about once per orbit to keep pace for about an hour, exposing my very good hands (TT, AK) when its folded to my push.

Its folded to me in SB w/ J4o, I think about it then push. BB has me covered by like 500 chips. He's been very reasonable, I think he calls with top 7-10% here. Clearly this is a +EV push as far as chips go. But was it correct ?

More importantly, how do I go about deciding if it was correct. And by correct I mean the move that maximizes long term cash winnings.

If this has been discussed elsewhere, sorry for wasting your time, just point me there and I'll go read it. Thanks...
CT