Moved up to $50NL 6max, got a couple of "iffy" hands...

[c_strong]

Hand 1: No one's mentioned this so far, but I'd give serious consideration to folding this to the preflop raise. The raise to you is 5% of villain's stack, so it is on the borderline between "clear call" and "use your judgment". You have the 4th worst pp, which makes it that little bit more likely that a set will get cracked if you hit, and more importantly there are two players yet to act. A squeeze play is unlikely at this level but someone slowplaying a big pair isn't. This is doubly true if you can't let it go if you don't hit your set on the flop. Villain raised from EP into 3 players so probably has a decent hand - you have to fold the flop.

Hand 2: I'd bet $5 on the turn - like you said you semi-bluffed the flop, and part of the reason for this is to get paid when the flush hits. Bear in mind another club will kill your action. Good laydown on the river.