Like I said I'm no expert, but I as one of a "few people" voicing an opinion would be interested to see some skid pad testing in wet & dry conditions to see how overall braking is affected. I suspect that the seat of the pants evaluation has typically involved stomping on the brakes in a straight line on a dry road. Maybe that is okay as most Pantera's don't see a wet road ever anyway.
We are all in agreement that upgraded and balanced brakes are ultimately the answer. Replacing the proportioning valve with a modern adjustable one would likely be a good compromise with stock calipers IMO.