sabertooth controller and servo issues

[d4vew557]

I've bought a 2x12rc controller for my bulldozer, now it seems that it can be programmed to some extent.

Now going forwards or backwards is fine but when turning its goes far to fast to the point the gearbox starts to slip.

Is there a way to limit this speed?


My next issue is with the screw drives, i have removed the potentiometer from the servos and replaced them with two 2.2k resistors but they just keep rotating at a fair speed. i have even tried swapping the configuration of the wiring to the resistors but no matter what the turn one way or another.

any suggestions would be appreciated