Have you tried any of the Peter Belt offerings, and if so which ones?
Years ago a friend and myself conducted blind A/B comparisons of Peter Belt Rainbow Foil treated CD's to duplicate non-treated CD's on my setup and I could ID the foil treated CD's everytime.
In most cases I thought they sounded better, but not always.
The foil was FREE, gratis of May @ Peter Belt.
I ended up treating a StatMat with the Ranbow Foil in order that I could easily choose to use it (or not) with various CD's and I also used a non-treated StatMat which I could again use (or not) with various CD's.
Got the idea of using the foil on a rider mat from Thorsten Loesche (sp?).
DeKay