B-bear,
1. The Venustas PC worked very well on both my amp and my EP-15A, but in both cases, the Dominus produced just a bit more openness or air. This difference must be due to the slightly different construction of the two. In addition to the extra thick Ferox shield of the Dominus, it uses 3 stranded and 2 solid conductors, while the Venustas uses 5 stranded conductors. Both are 10 AWG however.
2. Right now, I've got a 12 AWG 15 foot long twisted OFC PFN (manufacturer) cord connecting the two units, but I'm going to make up a 10 AWG shielded one soon. I haven't otherwise experimented.
My EP 15A (early model) didn't come with the two pair of digitally filtered outlets, and I've been too lazy to send it back and have them put in since I don't have any digital stuff plugged into it. For feeding to the SP-15A, what's more important IMO is that you use the oulets on the EP-15A which are closest to the incoming power cord. They are the ones that would be "first in line" on the internal buss, and "hear" less disturbance from the other devices plugged into the the EP. I plug the power amp into the next set of outlets, the speakers into the next pair, and the sub into the last.
The overall sound is amazing and the whole system only draws 450 watts at full tilt! It's all connected to one 20A dedicated circuit, which I found (I live in an apartment) under the kitchen sink in the form of a 20A single circuit garbage disposal outlet which was never hooked up to anything!