Having a proper dyno tune is the very best for your motor and Nels is one of the few best tuners in the country.
What have you done with the exhaust? Do you have a header system?
Both must be changed to make your Rocket run right. K&N 2780s will work under the bearclaw and do not need covers.
RamAir flows a little better and also fits under the bearclaw. I have run both, which are fine, but I got a tad more horse power with the RamAir.
Keep them clean (once or twice a year) for best performance and mileage.
I run the CES header system and recommend it for a stock engine. I get about 160 RWHP.