The one thing I've personally observed about the XI model is that some XI releases tend to be inconsistent in terms of going TTS. I'm a size 14 and go TTS all the time... oddly, TTS fits perfectly for me. The EXCEPTION for me is the Gamma XI model. It had that same problem you had, where the toe box crushes your foot. The general consensus about sizing for the XI on this board is you should go up half a size...However, as you'll notice, I don't even think JB makes 12.5s and so on for the big feet fellas.