Sounds like you got it running pretty good Herbie.
You are running about the same as I am. I hit 80mph once but got a little squirrely so never attempted it again. lol I'm still running stock nobbies. My front tire seems to be a little out of round and has a slight bounce at low speeds around 40 mph. I do have a set of 50/50 tires that I will try out once I wear these down.