-- Last Updated: Mar-05-13 3:15 PM EST --
I'm 6'4" and have size 15 feet too. I'm a bit lighter than you at 195lbs. I tried a bunch of boats and eventually found that the Impex Force 5 fit my feet pretty well and didn't feel too huge. I've since fallen in love with the boat. While I wish I could paddle a more greenland-style, this boat is pretty damn sweet.
Before this I considered an CD Extreme and the biggest Tsunami they made. I never got to demo a TideRace, though they seems like fun.