Allow me to add that the most important performance aspect of these wheel/tiller pilots--or any autopilot--is sail trim.
To make an autopilot work, especially when approaching its max wind capability, get rid of weather helm.
It may be necessary to alter course to reduce the pressures required for correction. Reef, change the sail plan, do whatever is required to balance the helm.
This is belabored --beaten to death, you might even say --in my video about vane steering, where the same needs apply.
https://www.youtube.com/watch?v=_gEJ3RJYiYc