Use spikes for the speakers. Make sure they rest on a hard surface.
+1 on this @erik_squires
The spikes under the Isoacoustic Gaias made a big difference compared to the granite plinths I had under the speakers. The speaker feet now directly couple to the concrete floor below.
In my system, the floor carpet helps tame a lot of echo. The music sounds very lively and nothing sounds dead. Experiment with the wall treatments and remove some if you find they deaden the music. Do you have treatment at the second reflection point? If yes, experiment with that.