First of all, raise more PF. I would make it .30 which is 4x + the two limpers.

On the flop, you are getting almost 4:1 odds for a call. Could he likely have a set? Yes, he limp called from UTG+1 then donked the flop. What other hand might he be doing this with though? Depending on the player, they might even do this with TPTK. He could also be doing this with JJ, QQ, or KK.

Do you think that if this same situation happened that you would only win 1 in 5?