Floor standing speaker isolation advice needed.

It would probably be easier and you'd get better results if you used a Herbies product rather than an unbalanced granite platform.
http://herbiesaudiolab.net/spkrfeet.htm

I use Decoupling Gliders on my hardwood floor. Heavy brass tip-toes on my speakers sit in the decoupler and there is no resonance introduced into the floor or back into the speaker (as far as I can tell).
Or you could try the threaded stud glider. Seems like many are getting good results with Herbies.

So I'm looking at the Big Fat Dots or X-Large Fat Dots on Herbie's site and am thinking skip the granite and spikes and just put 8 of these under the KEFs feet?

Thoughts?

Thanks again everyone!

Wouldn’t hurt to call Paul at Soundocity.com before you do anything. 

I know you said Gaia and Townshend are out of budget, but if they ever come into budget please do trial them. I found both upgraded my speaker in the bass department to an unexpected and astounding level. In Munich Isoacoustics were demoing their Gaia in the noisy main hall on an open stand. Two sets of speakers were running next to each other, one on Gaia one not. Even in this noisy place the differences were so apparent, as they switched between them A/B fashion.

I have tried thick foam in the past, under each corner, folded over so that the speakers gently rock on the four wedges. That did something and is nearly cost-free. Worth a try.

In the meantime, definitely try the spikes if you have a set as they will probably help a little.