Odd that introducing balanced cables produced a hum... Have you disconnected the cable from your satellite receiver to see if that could be the grounding issue source?

How long is the run between your D2 and Cinenova? If you're only going a few feet, it might simply be a matter of going back to unbalanced cables. Unless you're running a long distance or operating in a far more EMI/RFI hostile environment than a home, the case for running balanced cables can be a tough one to make (especially if the balanced cables cause more problems than they solve).