I witnessed, on several occasions, one of my friends trying to keep his R50 blades in track after an agressive flight
to no avail. It just would not perform correctly but now that he's flipping the grips we shall soon see but I think John Benario quite correct and suggest you read his article.
Apparently this problem occurs
mostly with plastic grips designed to handle blade pitch in a certain manner (LE or TE- can't recall just now).