johnthomas,
I have the same stack that you do. You should try splitting the DAC/transport from the two power bases. Put them next to each other, in stacks of 2 units each. If your cables go that far, put them each stack on either side of your amps. Big improvement there.
Elberoth,
The DAC IV gets hot, really hot. Mine is the non-plus, so I've got the perforated cover. I agree with you, MSB products look tacky, and don't inspire much confidence, and that's a shame, because they perform wonderfully and flawlessly. Put them next to a Vivaldi DAC, and I know which one most people will pick first... Anyway, check your DAC, as mine gets really hot, and since you closed all ventilation in yours, it might get too hot.
alexandre