You're going broke that way. You don't need to vary your UTG opening range, because nobody pays attention - and even if they got stats on you they don't have a significant enough sample size.
Flop play is tricky. I think you actually have close to 0 fold equity there. I don't know what happened here. You're probably c-betting A LOT and he's picking up on it.
I don't really feel like discussing the flop play, because wth are you doing with T7s in a raised pot???