That's interesting, Steve.

I find the Mini-T delivers a natural and uber-transparent sound into my low efficiency (83dB/W) but easy load speakers (6 - 8 ohms except at high freqs).

I guess that I'm not that surprised if the small power supply on the Mini-T runs out of puff and does strange things when given a more challenging electrical load. I suspect that would explain the lack of weight that you hear, the higher energy bass freqs are simply running out of steam.

Do you have some easier load speakers planned or available? You mention 95dB ...