I don't think I even have a bigger than normal head....never had an issue before now.

I think (only a guess) that somewhere along the way I've gotten very sensitive behind the ears so that the ones that put "any" pressure there give me headaches.

The dartboards were the only ones that would have worked, but they only had a white/grey arm frame style with a clear (not even shaded) lens. I really want to get interhcangeable lenses if I can since I do often ride day and often into the night/twilight too.

I did find a pair at Nashbar that may work.....but no way to try them without ordering them.
Nashbar Shades