ok you have made your set but the worse thing you can do is to just call the flop IMO.
i put the BB on either a big pair or AK again.either way i think he has got a big h in his hand.
you have him beat on the flop .
as for the first raiser,his call on the flop could mean anything from a semi high flush draw ,to a "im just waiting for some1 to bet so i can fold" .
you should have deffo made a bet on the flop,if UTG+2 stays ,then he is saying his got a hand that he is willing to go broke with and then you know where you stand.
as things stand and would just check behind and hope to god the bored pairs on the river,if it does not,you have position on the UTG+2 ,i would call up to a 1K bet on the river but not more.
you cant really bet on the turn though becasue any bet that could chase him away would make you pot commited and with the blinds of 15/30 ,4k is more than enough to recover.