Have you tried to replace the spikes under your speakers, and replace them by footers ? I find a better unity in the music from my speakers, and beefy sound, and more natural music.
Too many variables in play to recommend a specific approach. The design of the speakers - port in the bottom/front/rear, weight, type of the floor (what's right below the speaker, next layer, etc.), height of the rug, etc., etc. What works for me may and probably will not work for you. Rule of thumb; couple with concrete floor and decouple/isolate from suspending floor. My experience FWIW.
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