Very very interesting. As we have discussed, I found after experimenting with a few different damping, cones, supports (Finite Elemente, Stillpoints Ultra 5s, Ultras, HRS Nimbus/Coupers, M3, Vibrapods, even tennis balls, leaded weights a long time ago), I have found that Ultra 5s in combination with HRS nimbus/couplers are my favourite for power sources/transport. (For now on signal sources (DAC/Pre), I am still using HRS Nimbus Couplers/M3.
Somehow, while I found the Ultra 5s were a bit leaner in my system on their own (even the Stillpoints dealer could hear where I was coming from in my room)...I ultimately could not give up their exceptional clarity, improvement in timing (eg, syncopated rhythms between instruments became so obvious and clear, it was wonderful) and bass delineation and extension without a fight. Fortunately, after hours of experimenting with placement, I found that using HRS in combination with the Ultra 5...I managed to get all the benefits of the Ultra 5s (which are better than any of the things I have tried at what they do well)...plus the deep tonality I savor in my upper bass thru mids that 'returned' when I added the HRS nimbus/couplers to the Ultra 5s.