11s-33s: Mid pocket pairs-Odds for Set Value/Mid level

[rbear]

How do you tend to play mid pairs on level 3? Say you flop a set or better 1/8 times. My average stack size here is around 650. So, I leak 350 chips before I hit a hand here. I need to double every other time to make this profitable. With the chance of being raised, wouldn't you need to almost double every time you hit a set or better to make it profitable to play these? What kind of pot odds do you need (if any) to limp these? Anyone straight fold these on this level (EP or LP) General thoughts?

EDIT:
Small pairs also. Basically 22-TT