After driving my winter vehicle all summer while the gtp sits broken; now that summer is over, its finally fixed.

A new ebcm/bpmv was $3300 so it took some time to locate a used one. I installed it and the problem was still there.
Replacing the brake master cylinder fixed the problem. I theorize, the ports in the m/c were not allowing fluid flow back to the reservoir. This created the hard, high pedal feel. After sitting overnight, the fluid would bleed back and be normal until the next several brake applications. The dtc set in the ebcm turned out to be from the pressure sensor seeing pressure when the brake pedal was not applied. Why i was seeing more drag in the l/f i cannot explain. All drag conditions are now gone. Hope this helps someone....I'm going driving.

cleveland63b wins the prize...unfortunately the prize is me thanking you for being a repair wizard and a test drive in a now working gtp.