I'll second the Nobsound springs. I bought after-market springs for their bases. They take less than half the load of the supplied ones (same size). With those, I can fine-tune any component on three pods, using any number of lighter springs required. Now, everything literally gently floats, but no more than 1/8" travel.
With a combination of original and lighter springs all my subs float as well.
My speakers are a pain at 100 lbs (but a joy to my ears). Still, I'm designing a faux-Townshend platform that should utilize much larger 2-7/8" rate-specified springs. Anybody's guess but as prev mentioned, it probably can't hurt (unless the speaker falls over...ouch).