If the whole speaker enclosure vibrates back and forth relative to the floor (perhaps in response to the push pull of the woofer), the mid and high frequency information will be smeared, adversely impacting your imaging. In the spirit of reducing the susceptibility of the speaker enclosures from physically vibrating, I would want to couple them firmly to a massy object, like your lead filled stands and/or through to the floor. With this in mind, I would use Cones or Blue Tack. The Blue Tack flattens out and acts more like a layer of glue than a layer of rubber. I actually use Blue Tack in one of my systems. I would avoid the rubber bumpers. Good luck.
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