$55: Flaw in my thinking? (Pushing Top 67% at Lvl4 when not desparate)

[AA suited]

I'm beginning to rethink my strategy.

Background:
My 8-10th place finishes = ~20% combined, yet i have 15% ROI over the past 1000 SnGs.

I've tried playing less aggressively early on to cut my 8-10th place finishes but it's not my style. so i'm rethinking my strategy when i enter Lvl4 short stacked.

Old strategy:
I want to enter Lvl5 with at least 5BB. (FLAW??? [img]/images/graemlins/confused.gif[/img]) That way i can afford to sit out at an orbit if i dont get the cards and hope i get cards during the 2nd Lvl5 orbit when i'm down to 3.5BB. That way I don't have to push with Any 2 immediately.

Thus if i have less than 600 chips at Lvl4, i start pushing with Top 67% (ie: any face card like J2o) if folded to in LP to get to 5BB at Lvl5.

if the blinds have at least 7BB at lvl4, they're usually less likely to call with questionable hands like A7o.

New strategy:
Go back to being a Pushbot. Stay tight till 3BB no matter what the level, then push with Any 2.

Is my thinking that I need to enter Lvl5 with at least 5BB flawed?! If so, WHY?