Throttle end points should be set equal sides of center and in the 80 percent range. If you are over 100 move the ball in one hole and readjust.

For the pushrod measure the distance between the center of the throttle arm and the center of the servo spline, make the ball to ball distance the same and your pushrod will be perfect.

Set your pitch curves first, adjust head speed to suit using a combonation of throttle curves and needle adjustment.

The 50 should pull between 9 and 10 degrees pitch with no problem. You can reduce the high end throttle curve a bit but make sure you have cylic mixing turned on so that you can get full throttle when giving control inputs as well as cyclic inputs.

As I responded on RR read http://www.raptortechnique.com

Finally if your flying has progressed far enough, an rpm governor costs about the same as a set of carbon blades (i prefer the csm revlock but the revmax, throttle jockey pro and gv1 all work well) and you can set rough throttle curves and be done with it.