Both S&S and Morgan recommend to keep this puppy above 2700 at minimum. Having talked with many bikers they all tell you to keep it from 3,000 to 4,500 rpm for running under load. Anything over will start to get a bit ragged and it tops out at around 5,000 rpm anyway. Within that range it becomes very smooth. The steering issue will disappear except at idle. Everything shakes at idle.
Keeping it in the zone eliminates many problems with the drive train. The cush block will thank you and your car will thank you. You may find that you don't have to spend too much time tightening things down periodically. You will also save money as, I believe, most cush block failures and noise complaints come from lugging this engine.
