too weak w/ big pocket pairs headsup, when an overcard flops?

[chopchoi]

Hand #1: I open raise in MP with TT. 1 caller.

Flop: Q76 rainbow. I bet he raises I fold.

Hand #2: I'm in SB with QQ. 1 limper. I bet, BB folds, limper folds.

Flop: A96 rainbow. I bet, he raises, I fold.

these are tough spots. having a read on your opponent is important. calling down everynow and then would be ok.
how about calling the flop then leading the turn and folding to a raise?

this is a grey area since you are heads up. id rather call down on the Q high board. When the ace hits the flop and your opponent raises, it unlikely he is bluffing.

[BigBrother]

Both tough choices as you are most likely beat, but could be folding to a free-card play (more likely in the second case) or a tricky player who puts you on a missed AK (in the first case).

Heads up you are only giving up a small pot and it costs a relatively large amount to call down.

I think the best course is to mix it up between folding, occasionally calling down, and occasionally 3-betting or calling and leading the turn.

People smell weakness and it's easy for them to pump out a flop raise in an effort to buy the pot right there or see the showdown for free.