Hi Bill, just a clarification: earlier I meant transferable torque, limited by the slipping of the rotors. Yes the size of the disks can increase the theoretical torque (vs RPM) as in all physical reductions. But the actual amount transferable is limited by the point at which the rotors slip.
If however the motor speed is high, and there is a reduction after the variator to compensate, more power can be transferred through the variator than otherwise, before slip happens, since power is a factor of both torque and rpm.