I'll continue to try and break mine in, but damn it's a painful process. 100 miles on them and they still tear my heels up when hiking up steep terrain. Sent them back so the boot-smith could work on them. Didn't make much difference. At $400 a pair I'm committed to continue trying, just won't do it during real hunts where I can't afford to get a blister. I don't believe the theory of the sole breaking in and flexing. I think it's the front that needs to break in, allowing your ankle to pivot forward without the leather torquing your heel back. I've done a lot of mountaineering and wear extremely stiff plastic boots all day long, often carrying a heavy pack and climbing thousands of vertical feet in a climb. There's almost no break in either. I wear them on snow, ice, rocks, trails and scree with no issues. Those soles don't break in because they don't flex. The upper flexes, actually pivots forward, but not the sole. I don't know why the hunting industry doesn't learn from the mountaineering industry.
We'll see, hopefully next year I can write a post that my Kenetreks finally work great. Otherwise I have $400 door stops.