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I'd remove the powercommander and be happy with stock...not like stock power on a Rocket is something in desperate need of "fixing".
The powercommander acts to enhance performance by modifying the ECM's signals downstream, which can play havoc with sensors signalling for a certain response, then receiving another. A drop in mileage is expected since the PC richens the mixture pretty much across the board. However, your bike should run "okay" with it, so it sounds like the map loaded into it isn't right for your bike.
I'd yank it, get my money back, and wait with baited breath for Tuneboy software for the Rocket to arrive.
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