I figured it out. The lower rotor head had drifted up about 3/16" which was why I had to move the arms on the servo to make up for the added distance. I pulled out all 4 screws and had to spin the shaft while moving the head up and down on the shaft to find the hole that only 1 screw goes into. I got that done, and then had to recenter the arms for the servos, then adjust the linkage length again.