[ryjan]

UPDATE:

I have installed the Alltrax XCT48-400 IQ from D&D into my precedent. End-to-end install was a couple hours to remove batteries, drill mounting holes, wire everything, and put it back together.

With no modification to the settings I hit 18 mph on flat ground and 21 downhill. Huge improvement over 11 mph with the stock controller.

Thanks all for the advice!