AA24 on a 557 flop, PLO8

[WilyTilt]

http://www.pokerhand.org/?776249

I raise AA24 preflop, find 4 callers.
Flop is 557 with a flush draw I don't have.
I bet $25 and reraise/push my opponent's raise.

I really find it hard to figure out my opponent's range in in situations like this, where there are flush draws, low draws, straight draws, and possible trips/boats.

I'm slightly behind a bare 5 with no low draws; way behind a 5 with low draw; favorite against A2xx with just a flush draw; and I'm not sure what my equity is against a variety of A2+straight draw hands.

How would you guys have played it on the flop?

Thanks.