I've worn a lot of cowboy boots for a long time, never had this problem before. I bought a new pair of Justin Lacers, they fit like a glove & are very comfortable. I *love* them, except......
After walking around in them for 10-20 minutes, the outside of my left ankle joint starts aching, burning & stinging. At that time, I can consciously put more weight on the inside of that heel and the pain disappears, only to return immediately if I forget to shift my weight (BTW, I'm a 5'6", 138 pound man- on the small & slender side). I'm thinking that the large, flat heels on the Lacers are forcing a stress on my ankle joint either as my foot makes initial contact with the ground (which might be alleviated by rounding a corner) or less likely, the whole flat of the heel is off kilter to the angle that my ankle wants to be in (which might be corrected by planing).
I have a whole wood & metal shop at my disposal, no problem to perform a neat angle change or slick rounding of an edge or corner. Only problem is, I don't have a clue where to remove the offending material. The soles of my regular shoes wear on the outside rear corner of the heels, and the inside edge near the ball of my foot.
I'm sure that others have had this experience & if they stuck it out the heels of their boots have probably worn down to what I want/need to artificially accelerate. I really want these boots to work, talk to me :)