Passive preamp users help with McCormack Passive’s

Let me apologize if this gets long winded, but I need help with my setup. Currently I have a Sony DVP 9000es with Modwright Signature Truth Mods, a McCormack Micro Line Drive w/Gold upgrades, a pair of McCormack DNA-1 DLX Gold’s vertically driving a pair of Vandersteen 3A Signatures. I use Kimber Select 1020 I/C’s 1.5 meter from the Sony and a 2.0 meter pair to the amps. The problem I have is no volume control, by the time I turn the volume down low enough to listen the volume control starts to loose balance control, turning it up to regain the correct balance control and it’s too loud to listen. What I mean by this is all the sound starts to shift to the right side of the sound stage. At first I thought it was one of my amps starting to go but after swapping sides with the amps the problems remains. I was using a McCormack TLC 1 DLX but after trying the Line Drive with the Gold upgrades I couldn’t go back to the TLC. As far as the numbers go the Sony’s output is around 3 volts with 600ohms impedance and the I/C’s have 19 to 20 pF/meter Capacitance. Anybody have any helpful advice?