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Well, the swap to Curious cable did improve the dynamics so it appears the Morrow USB may not be compatible with the Intona. The VPI Brick held the Intona down (the Curious Cable is quite stiff) but I couldn't discern any effect on SQ. Long story short, my system sounds better without the Intona. I did come across some posts from Audio Circle that indicates the USB filters are very system dependent. The Intona still imparted a bit of haze on my system.
Oh well, another box for the audio graveyard closet! If anybody wants it, I'll let it go for $200 including shipping in the continental US.
You mention sluggish which for others could mean space and time between vocals instruments etc (better separation) maybe you prefer faster pace or you system already has enough space etc while this unit possibly creates more space which in turn could seem sluggish to you.
Either way it had an effect which is at least something in this increasingly difficult minefield of audio add ons.