Do you run a standard 19T gearbox sprocket? Your engine sounds pretty relaxed on the open road. I've got a 1936 MOV, I'm getting a spare 22T gearbox sprocket which should make the gearing about the same as a standard rigid MAC.
Would that make the gearing close to standard? I have to wait a few weeks to get the new sprocket delivered from Austria to Australia. Testing my new brakes this weekend.