What I did for my O.S. .91 wasw to mount a spare servo arm to act as a bellcrank. This allwed me to choose which holes the servo output and the final link rods connected to, giving a linkage which provides full throttle range with normal servo travel. (no end point adjusting)

In my case, I drilled and tapped the side of the engine bearer and used a small piece of brass tube as a pivot bushing. I used a straight across dual arm and the holes that worked best turned out to be furthest out for final output, and middle of 3 for the servo's pushrod. I used a ball-link on each end of the final link rod, which gave plenty of room for adjusting the linkage.