I did my first pull pull on the Cap in my Avatar. I stated a long discussion in one of the popular forums about the whole process. I'll search to see if an can fine it and will edit this post is I do. The short scoop is to make sure the point where the cables hook up is directly over the hinge line on the control surface. Then the cable attach point on the servo needs to be directly in line with the output shaft on the servo. That has been documented in an earlier post. My cables go slightly slack when the rudder is deflected and I have never had any flutter.
After you do the first one it is old hat the second time around.