You could ask Clearaudio for the advice. As for tuning as opposed to just absorbing, I will be the first one to support this approach. After all I have Michael Green free resonance speakers. You can easily overwhelm them with very loud music, but within their operating range they sound very natural.
Still I am puzzled by the collapse of the soundstage depth that you experience.
Also, turntable is not a cd player, you cannot really extrapolate.