I have a 40t rear sprocket and i love it. Also, i live pretty close to you...at least i used to. I lived on union street in bangor for 23 years. I live in milo now, but as soon as i get my fairings painted, I'll have my 300 in bangor a bunch this summer. I should be getting the paint this week. If you haven't switched yours over by then, you can try it out and see what you think. Mine is not modded like yours so a lot will be different, but I think you could figure out whether or not you like the gearing.