Here is the original post I made with my Dyno graph.
There are some useful links in there put in by some of the other club guys....well worth checking out.
I'm still trying to find out original HP claims for our bikes but they do seem variable in the "real world".
You seem to have done some very sensible mods already, anything else sounds expensive eg - cutting different valves, fitting another cam / carbs / exhaust system.
Just enjoy it
Cheers- Frank