I think you're recap of the game and your preflop 3-bet is a little rosy.

1. Smooth call the flop. If your set hits, great.
2. Your set hit, and UTG+1 has shown he's pretty committed. You HAVE to 3-bet here. That puts UTG+1 in a squeeze with MP1 still to act. IF MP1 is A/K or a higher set, which is not likely given the call preflop, he's going to stay. MP1 is the donk who will call.

3. I think it's very likely that you're still good here. There is a range of hands that has you beat - AQ, KQ, maybe QJ with that VPIP, but it's just as <font color="purple"> </font> likely that these guys are on AK, AJ, AT, or even A9 and they flopped, turned, or rivered 2pr.