Hand 1: I check this flop quite often but I don't mind the bet. You got a great price on the river but you're still only beating a pure bluff. I don't know how often he's bluffing.

Hand 2: I almost always re-raise preflop here. The hand plays totally different then.As played c/c or c/f river depending on read. He has the flush here a high percentage of the time.

Hand 3: Fine

Hand 4: I don't think 2nd barreling at 25NL is a great idea unless you have a read. Fold river.