benjie,
Not important to meet my criteria, only to qualify your experience with power conditioners so as not to unintentionally mislead. Your amplifiers more than meet any reasonable criteria for excellence and are VHC models, like mine. That, combined with the power conditioner models you listed, tell me that your observations are not surprising.
My point is that there are models available today that use completely different technologies and produce entirely different results. The two that I know of that avoid the shortcomings you have experienced are recent top models from Tara Labs and Synergistic Research that also deliver very positive results in noise floor reduction and soundstaging improvement. Most probably there are others. Everyone’s opinion of which ones work best is obviously valid and helpful, even if contemptuous, but dismissing people’s positive experiences with SOTA power enhancement, well, not so much.
Dave