Hi Harry
My evidence was a melting no plate and Remus end can that was way too hot due to superhot exhaust gas, coupled with a Dyno run that showed the air fuel mixture was too lean.
I have always said that other folks bikes may be different but if we discuss these things then anyone else with similar symptoms can be aware.
The fact that some bikes run leaner than others when changes are made is interesting. Is the make of aftermarket exhaust the issue, I used Remus.