@aj523,
"on improving the hifi “brain to ear” experience in my existing audio"
I sorta thought it was ear to brain. My point aj is that the equipment is where the money is not in these things. Most tweaks are only about improving the eye to brain experience. I think audiophiles would save a lot of money if they were blind, not that I would wish that on anyone.
If I take two identical cables and just put a fancy jacket on one and jack the asking price many people are going to think the jacketed cable sounds better. I admire your experimental attitude and if you can afford it, experience is the best teacher. The hard part is knowing your own weaknesses and keeping them from biasing the results.
I bought a Nobsound record clamp once. It was very disappointing.