I think that when you are lucky enough to get played back to, I would wait a while and then call. The delay, followed by a call,
makes your opponent think that you had a hard decision not folding the hand. This almost always ends with a big bet on the river by the opponent, which you will raise big and get paid. I think the effect on the opponent's thinking is more variable with a pause followed by a raise, as he thinks that you are just pondering how much of a raise he will call with his second best hand.