I have two 605BBs in my Ultra Stick 60 (Rudder and Elevator) and the linkage on them is as tight as you can get short of mounting the servo in the rear with a solid carbon rod directly from servo to clevis -- CG on this bird would make that almost impossible. There is no binding on them at all. They are both guided stiff piano wire. I've played around with the subtrm until I got discusted. I can center them with no problem The problem is when you then move them with the control they don't go back to their set center. They are off center by as much as a whole turn on the clevis.

While your spouting facts and not providiing the basis for them try reading some of the other posts in the Hitec (Mike) area -- I'm not the only one complaining about those servos.