Yes, I too am running the "B4" ball cups, you have to shorten one, and you can leave one long, works well. Also, I cleaned out my bearings, took the inside seal off of all of the bearings except for the ones on the shaft and it is rediculously smooth, now when i blow the grease out of the 4 on the shaft, it will be very free.
Also, sand down the teeth on the two gears, to "dull" the top of the tooth, like a pre-break-in