Hand 1
Sounds good to me. If you have a good read, go with it. Looks like you were right.

Hand 2
If you mean a value bet on the flop or turn, I don't think so. You just want to get to showdown cheaply. If you mean is your original river raise or a possible 4 bet river a good spot for value, I'd say it's good as played. I feel like you're definitely ahead here more times than not, which makes the raise good because many villains will just want to look you up. On the other hand, I wouldn't want to go broke here, so just calling the 3 bet seems fine.

Hand 3
You only had 38BB, so the hand pretty much plays itself.