retorquing the engine didn't work today. I asked the dealer to check the TB balance. The engineer said that the readings he got were (something like) 515,518 and 519 so everything was OK. I find that interesting because if I am reading these posts correctly the Triumph tool does not give specific numbers but just tells the engineer whether it's in spec or not. He also told me that even if he'd got readings that were out of spec he wouldn't have adjusted the TBs - he would have looked for the 'cause'. Go figure.
So I still have my vibration at 4000rpm. I think I will take it to a guy I know with a dyno and see what is going on at that rpm.
Mike