Weird spot on the flop in plo

[nsinger]

I havent been at the table too long, maybe 20 hands, but my opponent seems relatively solid; he's seen about 30% of flops and raised 10%, so not just aaxx.

I think this is a pretty easy raise if I have 40bb in cash or a tourney situation but made much tougher by us both having 100b.

Full Tilt Poker Game #5402975616: Table Master (6 max) - $0.50/$1 - Pot Limit Omaha Hi - 23:45:56 ET - 2008/02/25
Seat 1: nsinger ($100)
Seat 2: Sangwich ($96.55)
Seat 3: timtimmy111 ($103.70)
Seat 4: jpfish75 ($100.45)
Seat 5: mcorallo ($100)
Seat 6: showardNY ($74.35)
timtimmy111 has 5 seconds left to act
timtimmy111 posts the small blind of $0.50
jpfish75 posts the big blind of $1
The button is in seat #2
*** HOLE CARDS ***
Dealt to nsinger [Qc 5s Kc Qh]
showardNY folds
nsinger raises to $3.50
Sangwich folds
timtimmy111 folds
jpfish75 calls $2.50
*** FLOP *** [3c 5h 7c]
jpfish75 bets $7.50
nsinger has 15 seconds left to act
nsinger ????????


I actually folded here but i think that may be a mistake. My reasoning is that raising here likely gets me three bet by a set/straight and then I have to fold and just flatting pretty much turns my hand faceup as an overpair w/ flush draw, resulting in me not getting paid even if I do hit. Also a huge consideration here is not having the nut flush draw.

All that said, if I fold here all the time that pretty much means people can fire pot at me on the flop oop every time I raise and I'll be folding enough for it to be profitable for them to fire every flop. I don't want to be easily exploitable.

So what's the best line? Fold, raise, or flat and re-evaluate turn?