nice hands actually.
you might want to semi-bluff at the flop in hand 1 & usually you'd want to bet less than pot on the turn and the river to make it less obvious you have such a strong hand.

Hand 2 exactly what galapagos said

Hand 3, I can understand not calling with 55 if you were in the sb.
(Mp only has a 55bb stack & his raising range might be pretty wide so you wont always get his stack.)
But given that another player has called and you only have to put in 3bb in the bigblind you should definitely set hunt here.