Dgad, sorry again - Stillpoints, Spikes and other direct (or via one or several hard components...) coupling devices have nothing to do with isolation from periphery vibration. You just have a different "coupling" to the underground, but the vibration of the underground nevertheless does enter your components and its cabinet.
Static vibration vs. dynamic vibration ? You mean ONE frequency of vibration with constant amplitude versus a multiple of frequencies with alternating amplitudes ?
An isolation from vibration worth the name has to take care of all of this.
Thats why high priced isolation platforms (bench-tops and complex frames alike) are either active pressure supplied (Vibraplane et al) or very complex (Minus-K).
Some Stillpoints under your CDP will of course make a difference due to the relatively low weight and not very rigid cabinet.
The Stillpoint due dampen the groundplate of the cabinet and do - due to their extreme hardness - kind of speed-up the component-born vibrations to leave the cabinet.
But it does in no way isolate from outside vibrations.
Putting your CDP between two fairly heavy blocks of slate will most likely improve the sound even more, since now the cabinet can't resonate that easy any more and if, then with much lower amplitude and much lower frequency due to the vastly increased weight and direct large surface dampening of it top and ground plate.
If possible - give it a try.
I yet have to see the CDP which does NOT benefit from that particular method of large surface dampening.
