The way you are winning why change the setup. But if you ask me what I would do, TUBULAR. Look at it this way, no top racer in the US or world is using a clincher and there is a reason for that. You may be the fastest guy in the US on a tubed clincher. I will shut up since I am not answering your question and let others chine in on their 404 Clincher / tubless setup.
I hear you John, it is purely a cost thing for me right now, just can't afford a new set of wheels etc. And what the hell are we doing up this early!