How do I fix toe movement in my snowboard boots?

My boots fit nice and snug laterally (meaning toe to heel), the heel sits all the way back with my toe juuuust before the front of the boot, but there is what seems to be about a 1/2" of vertical movement (meaning the "floor" of the boot to the "roof"). What happens because of this is, when I'm heel-side, my toes are naturally forced upwards, jamming them into my boot causing pain and foot fatigue. It's as if you were seated at a desk and you jammed your toes into the bottom of the desktop. Is there anything besides buy new boots that I can do about this? My boots are pretty new and I don't want to have to replace them, but I will if I can't do something about this. Also, I wear Smart Wool snowboard specific socks, so that's not the problem...