Did you use the "Premium Silver" adapters at $249 or the more generic looking $89 version?I had a different experience with adapters. I've got a pair of Voodoo Cables 15A to 20A adapters that I used on some Elrod Master Diamond PC's to try them on my CH Precision M10 stereo amp at the time, and when I pulled the trigger and got the exact same PC design with purpose terminated 20A ends for this application the SQ improvement shocked me. The adapters were definitely degrading the performance in my use case. Not what I was expecting....