@scothurwitz
With regard to the isolation feet, which three brands did you try?I tried CMS and did exactly as you did and left them in for 2 weeks as my dealer said they would change over time and, as exactly as you said that they would get worse then better. I heard no change at all over the two weeks. Nothing. I also tried Stillpoints and Ansuz. I thought I heard something slightly better with the Stillpoint 6 under the CDP but with some blind testing there was nothing.
Funnily enough the conditioner I tested was the same as yours, Shunyata Denali v2 but as I say it did nothing but a little smoothing, which created a far less enjoyable sound. I do have two Shunyata Alpha EF mains cables in my system on my amp and CDP and they are fantastic, a real game changing mains cable for me. That and Townshend cabling in my system make a massive difference but I don’t count cabling as tweaking.