Supratek and Synergistic Active Shielding

I 'm getting a great deal of hum from the active shielding
on the output RCA's. I'm using Nagra VPA and a Grange. The phono is worse than the line stage. Swapped iC and PC's, bpt 3.5 and Powercell.

So I found the issue was with the ground wiring on the pre, the active shielding was just highlighting the problem. Supratek is great but a bit sloppy.
Could you define sloppy?
well, my grange has the inputs wired backwards at the pot.
All the right channels are actually left.