Anything you can put between spikes and carpet?

"I use standard spikes on carpet, Measure very carefully for perfect placement. Once I get placement just right, I stand on the base of my stand and push the spikes through the carpet."

I don't know if this is the OP's exact problem, but in my case, when I had speakers that were spiked, they didn't couple with the concrete floor underneath the carpet with the greatest solidity because the floor wasn't perfectly level. In homes with a poured slab, builders know most floors will end up with carpet and only take the time to float the concrete surface well in the areas that are going to get tile (kitchen and bath areas.) The living areas get a less well finished and level surface in many cases. I would have to move the speakers around in small increments to get an area where the speaker spikes all coupled securely. Having to move the speaker around like that isn't the optimal way to do it of course.

Adona makes some long sharp cones to go through the layers of padding and carpet.

Hockey pucks work great. I've never seen a spike go into them.

I use Timlub's method. And as the spikes are adjustable, I rock the speakers to figure which spikes I need to adjust to get them all seated firmly. I also use a level to set speakers.

The other thing I did, just last night, was to adjust the way I had the spikes set up. I guess since I bought them last year, I had the rear spikes significantly lower than the front ones to angle drivers back. This had been a sonic benefit with every other pair of speakers I've owned, especially the ones I had just prior to these, Spendor S8es. By accident, I was kneeling on my own listening chair with my head elevated above where it would be listening, and I noticed that the soundstage was much more coherent, forward, and three dimensional. Just to see what would happen I tipped the speakers onto their sides and adjusted the spike - front and back - to a uniform 2 1/8". Back in my chair with the adjusted spikes the soundstage coherence I'd heard while kneeling was still there and on the whole much improved. We'll call that a good thing found completely by accident. Still have to work on that bass though.