From exotic cables, to spikes, to fancy mains leads, to various cones, excessive contact cleaning /enhancements, various wall shelves, deep freezing CDs (yes, even that!) none of them were worth anything more than the initial thrill of trying and hoping.
Eventually the penny dropped.
My point is precisely that, "tweaks" are deceptive often because there is a world difference between a minor improvement with a costly product, and an incremental improvement one step at a time always in the same direction because of our listenings experiments about each embeddings dimension....
A tweak is NOT a method nor a methodical set of experiments.... It is a very partial solution on a deeper problem, i call the problem an embedding....
By the way even the springs boxes i bought were unsufficient by themselves....It was necessary for me to double the 4 boxes and put an heavy load to compress asymmetrically the sets on top and under the speakers....( something the sellers will not reveal if even he know it because this solution is impractical for most anyway). Then springs are good but not sufficient used like most want to use them directly under the speakers only...They improve the isolation yes but dont solve all the problems linked to the isolation and to the internal resonance by themselves out of the box....
No ready made tweak is more than a beacon on the road we must take by ourselves to improve the embedding (mechanical,electrical or acoustical)
I dont trust now any product more than my own ears and it is my ears that guide me to correct sometimes the product .....
I pay only peanuts and after 2 years my system is now relatively at my saisfaction and i can listen to any music with a perfect details imaging and natural timbre....My system (500 hundred bucks in all) is a "mini" top of the world audio system, thanks to an incremental sets of improvements each weeks for the last 2 years....
No tweak for me thanks i prefer to improve them my own way or replicate them or create some new one at no cost.... I succeed....
Then dont upgrade before embedding what you already own if it is some already good components...
:)