I think I sweat a lot more than most folks and am wondering if there's anything I can do to slow the flow any?

After a 45 minute high-intensity spin class, I look like I just got out of the pool, soaked from head to toe. I've yet to find a sweatband that can keep up on a 2-3 hour ride;most are completely saturated after an hour or two. Most people in my group stick to the "one bottle an hour" rule but I'm usually drink two+ and still get dehydrated more often than not.

At first I chalked it up to just being out of shape but now that I'm getting reasonably fit, the problem isn't getting any better. I'm 6'3 200 so I could stand to drop a few pounds but wouldn't consider myself fat anymore.

Is there anything I can take/eat/drink to help out?