Rvpiano, the SB-2000 is described as having the same 47K line-level input impedance as the SB-1000, so using the PV11 to drive both the SB-2000 and your amps should be fine.
Tim (Mr_m), first I'm pretty certain that the DC offset issue which Rvpiano experienced using his amps with the 2Wq doesn't apply in your situation. I believe that issue applies mainly (or perhaps entirely) to certain older designs utilizing ICEPower modules, while the Pharaoh is Hypex-based. Also, I don't see anything in the manual for the Pharaoh cautioning against connecting a sub or any other active device to its outputs.
As far as the issue you described is concerned, I'm understanding that the symptom just occurs on the output of the sub, and not on the outputs of the main speakers. And I assume it occurs on musical passages for which imaging is centered between the speakers when the balance control is set normally. If so it would certainly seem to point to an imbalance between channels in the input circuit of the sub, which would be surprising. And if so it may be worth contacting RV (the sub designer, not the OP :-)) and seeing if he can shed any light on it. Beyond that I have no particular thoughts about the issue.
Regards,
-- Al