You have great and revealing equipment so not surprised your hearing the PC differences.
I've had great experience with Shunyaya power cords. The Gamma is $498, so at your price. TheCableCo.com does 30 day free trials and they're very helpful. They have helped me with good advice and appropriate recommendations.
Once your Accuphase is broken in it might be good to contact them and see what they recommend and do a trial.