With the improvement you've made via the new feet, (by the way, I'm considering doing the same), if you install the $95 Mapleshade NanoMount tweak that uses miniature directional cones between cartridge/headshell, and tonearm/pinth flange, you will fully realize the advantage the new feet have given you. This product drains vibration away from the cartridge, into the arm, and then to the plinth. I proved this to myself when first I installed the NanoMounts, and was surprised at how little effect they had. Then I remembered I had sorbothane dampers under the VPI feet, and after I removed them, the difference was startling. Can't recommend it strongly enough.
Regards,
Dan