1. Easy call. BB was trying to isolate the shortie and certainly didn't expect you to have a big hand.
2. Again easy call. Villain 1 could make the same play with AA to QQ. Villain 2 has shown no strength and could be on a draw.
3. Definitely should have bet turn, if not the flop. Push turn if c-raised. As played, if you REALLY REALLY trust your read it's probably best to make a 1/3-1/2 pot bet and fold to significant c-raises.