So I used the 64T spur gear, and sure enough a 10t servo gear from an old HiTech MG worked for the motor side (with a little heat) Definite improvement though (ESC still has a little to be desired). Also upgraded the steering servo to an Adafruit HiTorque MG https://www.adafruit.com/product/2307. Then made my own brass bead lock weights by cutting down 3 of these brass bushings to about 10mm wide https://www.mcmaster.com/6381K221/ (remember to drill holes for air). For just a few bucks it elevated the functionality and fun factor "thumbsup"