One thing you may want to try, which im not sure appears in the build guide is to sand your diff plates.
Sand them down on 1000 grit Wet N Dry until you have a level shine across the face of the plate. Now rub them over 600 grit to add a light key to the surface. This will allow it to grip the balls but it wont hinder the smooth operation.
Make sure when you apply the grease you add enough to coat the balls and plates on both the thrust race (use associated black grease <no offence TD but this stuff is the best>) and the thrust plates. Place them onto the screw and run the screw over some tissue to remove the external excess grease. this leaves the balls covered, but nothing for dirt to grab to.
When you build the diff also apply a good coat of silicon lube (Schumacher is the best here) to the plates and to the balls in the pulley. Build it up so the diff is easy to move in the hand, hand tightenting until you cannot twist the pulley while holding outdrives. Clean off any excess grease from the outside of the pulley. Fit in the car and then do the final tightening with the wheels on, setting it to the point where it is smooth and you cannot turn the wheels while the spur gear is held in place.
That should be a good start point for you.
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