did you try on the boots a half size smaller? If you bought them from a shop which I believe you did, then go back and try on the smaller size. If it's really uncomfortable and your toes curl up than you may either want to try another boot or just stick with them. At around $200 invested I'd want to make sure they're the shizzle and fit right. I mean I have a bit of heel lift in my boots nothing major but it's there. My problem is I'm like a 12.75 and noone even makes a 12.5 so my only option is a bit too big or a bit too small. The too small is super uncomfortable so I always go with the boot that has the least amount of noticible heel lift and the one in which my toes are closest to the front so I don't have to worry about them sliding forward too much when they pack out.
Oh and enjoy the board!