Try Sorbagel under the PRE AMP and the CDP should help the harshness, and the base. Go to dang-good-stuff on e-bay and get the 2.25" 30 durometer a cheap fix if it works!!!
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If there are real acoustic changes it's due to reflections off the enclosure or resonances in it and not any differences in vibrations unless you have microphonic tubes.
You could take the door off and cut bigger holes in the sides, put 4" type 704 rigid fiberglass in front of it and to the sides (this is available commercially with wife-friendly prints), or move it somewhere farther from the speakers.
Thanks for the responses!
I have a variety of DH cones from small to jumbo.
I do have tubes but they sounded fine in the other open rack. I'll try it with the door open and some pillows inside of the enclosure. I'm having my shelves from the other rack cut to fit this new cabinet. I hope that is a step in the right direction as well.
I'm looking at the Sorbagel and the isonode from Bright star audio