I tried the aprilla mirrors following advice from here. They still shook and were smaller so had restricted visibility to add to the problem, so I swapped back. They were not original Aprilla mirros though, some £20 imitation so that may have been the problem. The thing that has improved the vibration most on my bike was changing chain and sprockets. I am still intending to balance throttle bodies one day which was the other advice from a very seasoned Mk1 rider.