hand 1: perfect spot to donk.

hand 2: i think you can even pot the turn, but $10 seems right.

hand 3: yeah, just call the river, not much value in raising

hand 4: raising here is fine sometimes, but obv not standard. your turn bet looks way more like a club draw than a set, so i would either bet bigger/call, or just check and give up, which isn't horrible because your flop raise is going to work a fair amount of the time vs said villain.