Best way to couple monitor speakers to stands?


I made some Sound Anchor copy 4 post stands for my Revel M20 monitors. They are very heavy and I think the sound is noticeably better than the stands I was using before. I am using 4 dabs of blue tack to couple the speakers to the stands. I wondering if big improvements can be made with something else. The top of the stands are 3/4" thick by 2" steel bar roughly the same size of the speaker and then at each corner a 2x2 steel tube runs down to a bass. Looks just like the sound anchor 4 post stands. I filled everything with sand/lead shot.

Is blue tack good enough?
128x128ejlif
Post removed 
The M20s have threaded holes in the bottom. When I owned the M20s I mounted them to my Sound Anchor stands via a plate I made with holes drilled to match the M20 mounting holes. I had to drill counter sunk holes in the plates to match the stands mounting holes. Once complete the speakers were firmly coupled.
The next question is, was the sound improved?
I guess I mean whatever sounds best. It's nice that the blue tack sort of glues the speakers to the stands so if they did get bumped they wouldn't come off, but what I'm looking for is whatever sounds best. I suppose acoustically couple the speakers is what I'm looking for.
Post removed 
Post removed