Nobody is overcharging their lipos (at least they better not be, they are asking to blow their, and whoever is around them, equipment up)....they are charging at higher amps to get them a bit warmer which helps the battery to release the energy (lower IR). As for your Reedy motor, try a 69/33-34 with 30-32 degrees of timing. The higher the timing the lower the window for optimal gearing. You are going down the right road with cleaning the bearings out and adding oil. I am not a big fan of the cut gears myself.