The trick with Nobsound, most components will only need 2 to 4 springs per footer, and some only 3 not 4. This leaves you with enough springs to do 2 components per set of 4. Springs fit perfectly into. 1/4" hole. So with a 1/4" drill bit and some wood, MDF, acrylic or whatever you can make your own.
Easily the bargain tweak of the century.
Yes it is very easy to over damp and dull the sound. All these things go a little at a time. Evaluate each step. When something sounds better, listen for what it made worse. Because usually there is a tradeoff with a lot of this stuff. Somewhere. The trick is to avoid using so much that the negatives don't start to outweigh the positives.