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?