I ride the 158 2011 Highlife with size 11 boots(reduced footprint), I am 6ft and 175lbs. Its perfect.
I can't see why you'd need the 164 (unless its for pure backcountry bottomless pow), it'll be like a plank and not playful at all at your weight, hard to spin too.
I would go 161 if I were you, you'll still have amazing float in Pow at your weight. You can get new boots if you need the reduced footprint tech, which you might at your boot size. Still better that than a board that is too long IMO.
Alternatively if you don't want to get new boots why not go wide? They do a 159 wide which will give you plenty of float and ease of spinning / tricks.
Much better than going long just for your big feet IMO.
Last edited by dreampow; 12-27-2011 at 11:19 PM.