[JohnGilb]

I don't think this really helps you.

So, here's the thing (Ether or one of the mecanum experts can correct me here): in an ideal environment, there is no difference in power applied forward/backward vs strafe left/right. The reason you see bias in the real world is because of the internal friction in the roller bearings - this effectively means the wheels aren't providing power at 45 degrees, but rather some other number that is typically biased towards front/back.

All you're doing here is combining two imperfect drives orthogonally, so instead of max speed in one direction and 60% in another, you're probably going to have 80% in both, as the fast drive will be "dragging" the slow drive.