new live 5-5 plo game at bike...big hand

[limon]

plo hi only, super deep plo isnt a daily occurence so i have to admit im a little rusty and may have some fuzzy thinking.
pot is straddled laggy bizarre utg w/ 8k limps, i w/ 3.5k raise to 30 in cutoff w/ 2d3s3d5s, looose passive button w/ 9k makes it 100, utg calls i call.

flop is 378 rainbow. utg checks i check and decide to get in a check raise, button bets 200, utg makes it 600, now utgs range is any 2 pr any set any draw i decide my best play here is to call and reassess the turn. i have a feeling utg wont lead out w. 2pr once i call here. so i call and the button calls putting himself solidly on an overpair, should i assume he has a draw to go w/ it?

turn is a j no flush draw. utg checks as i have hoped, i bet 1500 now button pots it, utg folds set of 7's face up. i decide the button has aa9t cause w/ stax so deep he cant move in in front of the other huge stack w/ jj and i should call, so i do. he actually turns kk9t, we run it twice and i escape w/ a chop but i really felt uneasy about my thought/decision process and feel i need to think about the game a little before going back, thoughts on all streets appreciated.