Grinding Calibers

The best way to remove the least amount of material is to look around and find pictures of calipers done. That will give you a better idea where to start.
Once you have the large "arch" removed, use a permint ink marker and color the the top of the cailper.
Trial fit the wheel and turn it back and forth a couple of times till you "mark" where it's hitting. Keep repeating this process till you can freely spin the wheel.
I suggest grinding a little more around the corners of the caliper for extra clearence.
I'm sure someone else can help more.. pictures



