Hand 1:

No f'n way you laydown this hand before the river. You're way ahead of a King and have 2 outs against a Ten. 3-bet the flop before going into check + call mode unless the flop raiser is really weak/passive. However, you might be able to fold the river, as just about any hand raising the flop now has you beat.

Hand 2 + 3:
Very well played. With LAgg acting after me, I'm looking for another seat/table though.