My friend has a 1/16 summit and I have the merv. We are switching over to an off road rally or buggy style truck. The issue is now gearing. Before on bigger tires and lower gearing we could hit speeds up to 50 plus on 2s. now we have smaller buggy wheels and tires and have a 45 spur and a 34 pinion! the motor and esc are nowhere near getting hot and we are still only running 37 mph according to GPS. Any suggestions on what's goin on?