What do you push with ITM?

As you may notice I'm new here. I played ~150 $22 SNG's a few weeks ago at Party, and I started very well, but later my ROI dropped to 10-15. I started playing $33's yesterday, not because I believe I can beat the $22's, but because I think that with my bankroll I can easily play there (>150 buy-ins).

I've now played 32 $33's, my ITM is 41% and my ROI is -20%. This is partly bad luck, but it's still horrible. I think I could really improve my play in the money.

So, assume we're in a typical $33 SNG, 3 guys left, blinds are 200/400 and you have about 5-6 BB.

What do you push with now? Do you ever not push but call/min raise? If you are on the buton, what would you do with these hands? QJo, KJo, pocket pairs (which will you play?), JTs, A8o, A4s, Q9s, etc. Are these good enough? What's the worst hand you'll push with?

And how does it change when you are chip leader, or the low stack?