Hand 7: Raise preflop. I'd rather lead the flop than to c/r, but c/r is ok. As played I don't like the check fold, I would lead out again here for about 2/3 pot.

Hand 17: I would c/r the flop, not c/c. If you're going to c/c the flop I would go for a turn c/r, but leading is okay here. As played yes either c/c or c/f river. Betting sucks.

Hand 18: No way am I folding here, especially given stack sizes.

Hand 33: Depends on your read of the player, in a multiway pot I think this is pretty standard. Flop raise is kind of blah because only AJ really calls that we beat. I'd call the flop and fold to another big bet if I thought villain was a TAG. Multiway pots tend to keep people honest too. Even if you occasionally fold the best hand, it's better than to get it all in drawing to three outs.

Hand 37: Wait for the blind to come, as played raise the flop, there are many draws out. The turn is ok too I guess, but the river is a fold against most players, this is almost always the nut flush more than it is some random bluff. Some players this is an easy call, but most this is a fold.

Hand 38: Standard, I like the way you played it personally. Call the flop raise and c/r ai on a safe turn, you executed it well but got sucked out on, that's poker.

Hand 39: Fold preflop, especially since it's multiway. QJo doesn't play great in that spot. As played you have top pair, might as well push with your stack. Another bad beat, happens.

A couple months ago when I played 25nl/50nl I actually transitioned very well and didn't look back. Play good solid aggressive poker and you will win, it's really that simple. Don't let the short term affect you, losing a couple of buyins is no big deal.