The stock Voyager sounds really good after I replaced the leading edge muffling stock rubber feet and got better still as I replaced all my 5+ yo machina dynamica springs with these. Outstanding improvementThe mind is indeed a miraculous thing....
What frequency and amplitude vibrations are you trying to damp? What was the spring rate of your old springs versus the new ones? Are they even different? What is the old versus the new damping ratio? Have you checked to see if it is different or for that matter an improvement? How do you know the damping hasn't worsened?
This is why these "tweaks" are nonsense. It's all in your head until you have some objective basis to actually show a change based on reality.
I hear if you smear peanut butter all over your amp it will sound chunkier.