This is my experience too. I picked up some used B&W’s and sat them directly on the wood floor because the seller didn’t has the stock spikes. I went with Herbie’s Stud Gliders because $150 was more my speed and because these won’t be my forever speakers. The subwoofer saw a similar, dramatic improvement. This tweak is more than just a tweak.
In my limited experience, the only other tweaks that made this big of a difference were a reclocker between the streamer and DAC and a fiber optic run to isolate the HiFi from the dirty side of the network.