Are you sure this is arch related? The area I notice the rubbing it is on top of the knuckle(is that the right term?) of my big toe. If it is arch related then it confirms my suspicion that feet be crazy.
Sorry I thought you were referring to rubbing on your forefoot. Rubbing on the toe joint probabbly is a fit issue. The captoe probably has too low a horizon for your foot/is not high enough/does not have enough volume for your particular foot.