TimTim,
I just built Hypex UCD400HG with HXR monoblocks. They exhibit none of the characteristics you lament in Class D. I built them with a Furutech IEC and Furutech RCAs, Neotech wire and Cardas Patented Binding Posts. They are simply excellent IMHO. They kicked my Berning ZH270 out of my system. In fact, they stomped on my Berning in every respect. The Berning simply isn't better in any area.
Treble is sublime and glare free, soundstage is wide and deep with excellent air and 3 dimensionality, bass is tight, deep and controlled, imaging is excellent, tonality is spot on, etc. They simply exceeded my expectations in all areas. I couldn't be more pleased with the results.
BTW, I am looking forward to hearing your new cables!