I agree with mcatdog, I think you played hands 1-3 well. I definitely wouldn't rule out the flush in hand 1, I see lots of players chase flushes even with pot-sized bets to them. That being said, I don't play it differently than you did.

As for hand 4, I also agree with mcatdog I just wanted to add that I'm one of those people who does "stupid little check-min-raises" with TPWK, draws, and air. (And occasionally made hands with no draws on the board.) I don't do it very often, but it's been profitable picking off c-bets. Since people do this, and you're getting almost 5:1 on a call, I think you should see the turn here. If it's blank and he leads with a big bet, then fold.