I am not sure on the 32 pitch gear but I do have an answer on how to fix the gear stripping problem. What you need is a thicker motor plate. The stock plate flexes under a heavy load allowing the gears to slip and strip. A .125" thick motor plate made of 6061 or 7075 will stop the stripped spurs and add extra material to act as a heat sink for the motor.
Good luck and let us know how it turns out.