I have pretty much the same setup as you except for the exhaust system. I have the V&H Powershots -- Baron's ported manifold, BAK, Dyna 3000 at 34a and AIS removed. From your mileage I'd say you're probably running on the rich side. The Road Star will run rich and it's probably less exacting to set it up to run rich than toward lean. I routinely get about 50 mpg even with some interstate running at higher speeds. On just secondary roads I've gotten as high as 58 mpg. Settings I'm running are: PMS 2, needle at 3.5 and 172 main jet. I've thought about backing down on the main jet but so far it hasn't seemed like a problem.

I believe you could do yourself some good by rejetting and there's always plenty of help on this forum. My fear of the "sticky valve" syndrome is why I try to jet toward lean.