I have been very happy with the performance of a set of AUVA -70 speaker isolators from Stack Audio. I'm using them with my Aspen FR10 speakers on a carpeted floor in a first-floor living room that sits above an open basement space below. Each AUVA isolator (using four AUVA-70s under each speaker) is fitted with three spikes, and the spikes can be selected in whatever length is needed to puncture through the carpet and pad to reach the plywood flooring underneath. This results in a much more stable connection to the floor than could be obtained with the stock spikes that came with the speakers and rested on top of the carpet surface.
However, as you know, a more direct connection between the speaker and the floor may sound worse if it simply allows more vibration to be transmitted back and forth between the speaker and floor. The nice thing about the AUVA isolators is that they include compartments that control vibration transmission a lot better than a simple spike can.
@hazeloop if you can't get the Gaia isolators to work well enough, you might want to try out the AUVA-70 or AUVA-100 isolators.

