I agree with 'most everybody here as to your dyno guy being your main problem.
The 110s definitely are much happier with a richer AFR.
The '09 SERG already had V&H power duals w/ Roland Sands Design mufflers when purchased last June, I like 'em, they seem to have good power characteristics to me. I think that the RSD mufflers have more backpressure than the ones that you have. ('Don't think that they sell too many of the RSDs, since they are quite pricey)
When I called Doc awhile back and told him that I had Power Duals, he said they were ok, he did not seem familiar with the RSDs.
When are you going to Thunder Beach?