I am now pretty certain that it is indeed a volume issue. Not room related. I started playing with the volume knob and very slowy began to turn it clockwise. The right speakers begins to have sound coming from it before the left channel. I guess that probably means that the right speaker is slightly louder than the left, therefore causing the image to shift sligtly to the right of center.
One more test, cross the ics from the preamp to the power amp.
Right out of the pre to left in on the Amp.
Left out of the pre to right in on the Amp.
Is the off center image shifted to the other side?
Post back.