My dealer, Morgan Motors of New England, told me he set mine to 0. It is a bit twitchy. There have been many discussions about the steering. Most of it boiled down to: Morgan took the easy and cheap way out when designing the car and totally ignored Pete Larson's steering solutions on his 3 wheeler. Too bad as it works. We have twitchy steering and excessive tire scrubbing. I've gone through 7 pair of fronts in 55,000 miles.
Good luck!