If your shoulder was the hinge line and your arm was the control horn. At your elbow it might take 50lbs of pressure to push your arm down while holding it out straight. At your wrist it will only take 25lbs. This is the same as a control horn. Out at the end it is easyer for the servo to push it than at the root. It is the opposite at the servo arm. Stand an arms length from your buddy with your arm sticking straight out to the side. Push him on the shoulder and try to move him forward. Then move 1' closer and move him with your elbow. It is easyer with your elbow because you have more leverege. The same for a servo. The closer to center on the output arm the more power it has. The problem is if your pushrod is all the way in at the servo and all the way out on the control horn the control surface will only move maybe a 1/4". You have to find the middle ground here. Have the control rod midway on both and if you have enough throw your in business. If not move out one hole at a time
until you do. Hubber says not to use the radio to turn the travel up to 150%. I would take his word for it and use only the linkage to get the proper throw. I hope this gives you a better understanding. later daveo