Change it up and check out Russell Moccasins. Custom built to YOUR foot. 20 years on my fist pair, resolved twice. Had another pair built with extra ankle support after a major ankle injury. Not mountain boots per se, it the toughest and most comfortable boots you will ever own.
Took a look at the website. They WILL do large sizes. Which is cool. I like the idea of spec'ing the sole and insulation. Hmmm....