We don't recommend setting the flapping shims with tight friction anymore, as the friction changes the track will change. We actually shim the flapping bearings inside the U block now and don't worry about the friction at all.
In my extensive experience tracking Enstroms, I found that the best procedure is to leave the shimming loose enough that the grips do not stay up. Our latest tracking procedures (which I wrote) can be found on the web site under; Support : Technical Support : Tech Tips.
Also there is a revised TR balance procedure. Placing the accelerometer horizontally takes most of the hassle out of the balance procedure.