I had the same deflating experience with DNK:
Performance Placebo. And they still have the gal to spam me with email promotions after sending me off on my bicycle (?).
I loaded Penner's map and have had none of the issues I experienced with DNK's. And the performance boost was immediately applauded by the 4rse dyno on my first ride out. Penner's are probably still the best TuneECU maps for the Rocket 3 motor - and they are free. Even Richard uses it as the starting point for tuning the TTS Supercharger.
Thanks once again, Penner. I've tweaked your map a bit, and I must say that I am chuffed to bits with my Rocket as it runs now.