Sounds like you do your testing exactly the same as my group of friends and myself. We are also going to be testing the HF cable (HF CT-1 Enhanced) against a CPT 300. I have had my CPT cables for a few months and they sound very different at 500 plus hours than they did at 50 hours. When we do our testing we will take the time to allow the HF cable a break in time of minimum 500 hours because we want to be totally accurate on our comparison. Perhaps someone out there could tell me if 500 hours is long enough of a break in for HF power cables because I know that 500 hours is just where the CPT cords really open up and start to play the whole frequency range.
Cheers,