[moldman]

I think you answered your own question here in your description. You said he's very aggro with flush draws, and he check-minraises you. This is usually one of 2 things - flush draw or the nuts. If that's your read, you have to weight it in that favor. Considering you have your outs to fill up, this is an easy push IMO. And who knows, you might have flush outs too.