#1: I'd overcall and give up. As played I'd bet turn small and shove river.

#2: Don't really like sizing and the fact that you left an overbet for the river. I doubt you will be ahead more than 50% when called since he still has all Kx hands in his range.

#3. This isn't very deep. I think shoving could be a fun play if your image is terrible. Probably just c/f though.