Setting up Pull Pull on my 30% Pilot RC extra 300 and I have some questions. I'm using the outer holes on the control horns which is about 4inches and I'm using an SWB 4inch offset servo arm. I have the cables crossed. Both cables are tight when ther servo is centered but when I go in either direction both cables get slack in them. Is it normal for both cables to go slack in either direction but to be tight in the center?