I'll go back and see if I can figure a way to push my basic fighting stances wider without losing options. I've already done that in my throwing stances, to the point that I have to remind students to follow what I teach, and not my accommodations.
The problem starts somewhere around 45 degrees. For large changes in levels (slipping a strike from someone shorter, for instance) I'll end up beyond 45 degrees. Part of that is because of the distances I use when blending - at close distance, wider stances limit options too much. It's just something I've learned to work around where I can, but it limits how much time I can spend on some drills.