I'm running the Align 750 gyro. When programming that I can set the travel. What gyro are you using? My tail set-up looks just like your in the sense that everything is centered and 90. On my Pro the tail servo is housed inside the rear of the heli. I didnt do the boom mount like others and just left it the way it came. The 750 gyro doens't have a "limit" pot rahter a set button you push then you move your rudder stick left and right for how much you want it to travel.