I check the turn-- we'd have to fold if MP2 was the one raising or reraised UTG (or even if he just called UTG's raise, right?) and I'd rather take the free card to catch our 4 outer. I look for a cheap showdown here. Another A isn't going to call your turn bet with the flush hitting but they might call a blank river or bet weak on the river that you can call. If we check the turn, the flush probably just valuebets the river weak also. On the turn, I'm ready to dump this hand to a push. I'm expecting a made flush to check to us on the turn so I don't really see that check as weakness. The pot's getting there but not quite big enough for me to care enough to invest a lot more to win it.

And I'm in total agreement with you re: short stacks-- I think it is spew getting overly aggressive just because a short stack is in there passively calling your bets and you've got a decent middle strength hand.

I don't think overbetting a $1.75 pot to $9 is worth it with 3 others behind you to act, 2 of whom are close to 100BB deep. In this instance you'd have won the hand, but I'm not sure what I'd do if one of them just called. We can't think that we're ahead if they raise or even just call, can we?