Question: have you ever lubricated your MSR?
I got my Microheli blade grips last week and the ball joints do seem tight (just like the swashplate) but it's not the ball joints that are the problem at all - it's the feathering shaft. That's right, if you take some silicone spray (Liquid Wrench) and hit your feathering shaft, you'll be good to go. The feathering shaft is where the blade grips are binding, not the ball joints. Unhook the connecting rods and try to move the blade grips side to side - I'll bet it's tight. For the record I installed my brand new blade grips and a brand new flybar and a brand new swashplate and used all new connecting rods and there is no binding at all - since I lubed the feathering shaft. I also lubed the bearings in the swashplate as well as the upper and lower frame bearings and you wouldn't believe the difference. The entire rotor assembly moves 2-3 times more freely than before. Some people seem to think that most TBE problems can be solved by sanding the ball joints. Try some lubrication instead - your parts will most certainly last longer. Sand the ball joints - what a laugh.
Oh yeah, and the Microheli grips do not require the installation of the brass washers so if you somehow managed to install those, remove them.