Reraising all-in when you're likely to be called in STTs?

[nomdeplume]

Hi,

Newb question. I've noticed that when playing turbo sngs after level 5 (or sometimes even level 4) any reraise is likely to be called.

Given that STTs are all about surviving into the money, at what point does it become 'correct' to reraise with a decent but not great hand (like 77, AJ for example) if you think there is a good chance of being called and having to race?

I currently tend to avoid reraising altogether until my M drops below 5 in an effort to avoid coin flips until I'm in the money, but I'm wondering if I'm missing out on too many +EV situations by doing so. Should I be doing this earlier, say when my M drops below 10 (Harrington's Orange Zone)?

My guess is that the answer is "it depends on what hands your opponent will raise with from that position after N limpers", in which case can someone tell me how I can calculate whether such a play is +EV given an opponent's assumed raising range? Or should I just avoid coinflips altogether until I make the money?

Thanks