I have Sistrum stands under my speakers and mono blocks which are between the speakers to excellent effect.
My DIY rack is 3 3/4" Butcher Block with brass threaded rod through to the floor using acorn nuts top and bottom. At some point, about a year ago I decided to use some Herbie's Giant Cone Decoupling Gliders under the acorns on the floor, hardwood. They make the equipment much easier to move as well as preserve the floor. A definite clearing up of the musical resolution.
Roxy54, I have yet to completely understand if the Sistrum stands couple or decouple, but like you they are in my system to stay.
In What's Best Forum, garylkoh has an extensive paper on the coupling/decoupling subject, quite extensive and informative .I read the whole thread and the splitting hairs and opinions abound throughout.
And Eric, yes the decoupling does leave the situation of back and fro movement or rather the stability of the speaker in doubt, according to Mr Koh.
Bottom line, if it sounds better go with it. I mean, it's a hobby so fiddle away, right?