[FishyMcFish]

Mark the opponent down as someone you'd like to play with all day if they call UTG 3 x raises with 7T.

Pre-flop fine, I don't think players in a $1 are concerned with implied odds and would have the forsight to call marginal hands to hit a big flop. Flope bet was okay but try betting less, it means you are getting info from him and building a pot without commiting yourself to it. If he calls then you know he has something of it, then you can lead for less on the turn, see the raise/all in from villain and throw your KK away.