Did a quick search and couldn't find what I was looking for. I currently have TR Mountain Khyber Hybrid's (the ones USMA said we could get) and have been TRYING to break them in. I went on a 6 mile run with a 30lb pack on 2 days ago, and came back with horrific blisters on identical spots on each of my feet; specifically the back of my foot, right where my achille's meets my heel. I wasn't wearing the thick boot socks that I recently ordered, and they were not laced up as tight as they should have been. My mistake on being stupid. I went out yesterday and the blisters were killing me. They are grape sized holes in my heel... I ended up walking my route. Today, I was on Belleville's website and followed their sizing instructions and got the boots very tight for 'proper heel placement' and they felt better, however, I believe my problem is the size of the shoe; I am still getting 'heel lift' and my achille's/heel is rubbing hard on the seam when I run or go up an incline. What would you guys recommend? I am making a pilgrimage to Carlisle this Friday to try different sizes on. For you boot experts; would sizing down from my current 11 to a 10.5 or 10 alleviate the annoying 'heel lift' that is tearing up my heels?