I just got a new lrp spx speed control and an eraser 13.5 motor right from lrp that replaced AI system under warranty. So I hooked it all up and programmed it just like the directions say, and it goes good in reverse, but coggs like a son of a bitch in forward. And not much speed. I reversed my controls and reprogrammed. But still the same. What do I do. Any help would be great.