I tried some Iso Acoustic Iso-Pucks under one of my Thiel 2.7s tonight.I'm not familiar with this product but, as a rule, isolation footers should be used only for electronics and, maybe, cables but never speakers. I'm not surprised you didn't have good results.
I am using small wood blocks under the spikes of my CS2.4s but only because I am protecting the rug they sit on . . . I'm not willing to damage the rug. At some point, I will take the rug out and listen for how much, if at all, the wood blocks are degrading the SQ.