Hand1:
You have 6
on the board and in his hand.
There's nothing you can really do about hand1. It doesn't matter what credit you give to his wide range, as you didn't have the A
and there's a lot of hands in his range that you're ahead that could be jamming here. You also still have outs regardless of his holding, and you actually still have 27% equity even against 2p. This is just a normal high variance call vs. poor players. This board was too wet for you to assume you were behind 2p. He could easily have all sorts of combo draws, K9, flush draws and other hands that you're ahead of. Chalk it up and get him next time.
Hand2:
This hand would be an easier fold if you bet 1/2 the pot instead of how large you did. As played, I think you have enough equity where it's probably a call but you don't feel good about it as you're often behind since V has to have Tx for you to be ahead here. I'd probably still find a fold if I have a good read that V plays passively without nutted hands, though, even if the math says I should call. This is a situation where you can decrease the math with live reads. If you haven't seen V perform this type of play with Tx then you usually have to give them credit for a 5 here.
Hand3:
Did you open the $15 after the limpers were in? If so, you need to raise more. If the standard raise was $12 and you had 3 limpers ahead, you need to make it at least $21-22. I'd probably make it $24. Your stack is going in on that flop regardless. As played, you just got coolered and, as in hand1, still had outs.
Between Hand1 and Hand3 you're going to win a bit over 1 in 4 of those even when you get your money in behind. You just happened to get 2 of the 3 expected losers. It happens.