Ok, so it wasn't the set screw in the main drive cups, but i can better explain how the system is working because of that. on the ground, if i spin a wheel, they all move a little, but there is alot of slop in the front drive section. its about a 1/4 rotation of the rear wheels before the fronts even think about moving with it, and even then it feels very loose. I'll take the front section apart later to see if i can check those drive cups.