[tewall]

From the way you've described the fellow, you must expect to be ahead of him. Plus the stacks are small. So I can't see how you can get away from being committed to all-in in this situation. Just because the flop sucks is no reason to assume it's hit him.

I think you need to assume you're ahead, which is very likely true (unless he's the type of player who would autobet unless he had something good to c/r with). You have to bet to protect your hand. A standard bet, like 150, is enough to keep him from calling correctly with nothing but a flush draw, so that seems fine. If he comes over the top, call without hesitation as your getting 4 to 1 for your call.