hand 1 - I think the 3bet sizing seems fine. I don't mind the turn c/bomb, given that the river pot will be 1400 with only 600ish behind. If there was a little more behind, I'd prefer c/c turn.

Hand 2 - I like it.

Hand 3 - Agree with rest about c/c flop. As played, I like the "scared of the K" turn c/c, and I'd c/c riv again. He can def put you on like QJ/AJ and try to bluff you on river or value town himself with AK/AA type stuff. KQ even.