Well this is quite interesting indeed...
I meticulously (see moniker) cut small squares of the above mentioned rubber flooring and slid them between the amps footers and glass. I was anticipating no effect, LOL, I was wrong.
I'll preface this by saying I make no audio assessments on Friday night's. My system never sounds as good on Friday night as it does on Saturday night, with the best day ALWAYS being Sunday (all day). That said, with said rubber squares there was more inner detail and better soundstaging, but the bass is not as tight. I will continue to assess throughout the weekend, but I'm already thinking that the amps WILL benefit with some sort of iso device.