Originally Posted by ChrisakaBiff

I had this same issue with my Bomber with the exact same setup. Buttery smooth in reverse and cogging like a mofo crawling forward? I figured out the sensored motors don't like to run in reverse efficiently with the MMX for some reason?!? So I flipped my ring gears around front and rear to correct the motor direction to normal instead of reverse and bam, no more cogging!!! :-)