Oh do I know what you are talking about in reference to normal.

My toes do the opposite, they cramp downward. They have yet to really figure it out and I'm going to Boston (aka the big city) to see a sports medicine specialist who hopefully can figure it out. Mine is definately from my posterior tibialis muscle because if you push on the inside of my calf I want to jump out of my skin! It's all from poor arch supports in that I think I spent years thinking my arches were low and they are really high. Who knows.

The ball of the foot thing is very odd...most of the time injuries to the feet is because of impact like running and jumping, I hardly found anything about cycling. I'll mention it when I go to this guy, I'm curious about it myself...hang in there!