Cabelas 2000 gram boots and two toe warmers per foot. The trick is to put the warmers on top of your foot, not on the bottom. No room for circulation on the bottom of you boot but you have "head" space above your foot. The other thing is I don't tuck my pants in my boots anymore. It allows the heat from inside you boots to escape up your leg and your feet will not sweat as much! I also put my boots on the dryer every night so they are DRY the next day.
I found out the hard way for putting those warmers on the bottom of my foot, after a long day of driving deer and a lot of walking my foot was hurting pretty bad but your deer hunting so it can't be that bad, end of the day took my boots off and I had burned a hole in my foot. Some how the warmer broke and the magnesium powder stuff burnt a hole in my foot!!!! When the air hit it, you talk about pain. Never again
Sorry Deer Patch off topic but semi related
It may have not answered my question but it was very good information to remember. Did you have permanent damage to your foot?