[Kenth]

"Welllllll, as we all know, full manifold vacuum REDUCES upon engine acceleration, because engine vacuum reduces as throttle position is increased, during engine acceleration. So, there would be no additional timing, no second acceleration curve as this occurs."

Since manifold vacuum is reduced at the same rate, ported or full manifold source to the load compensator the result would be, and what i have found, the same, reduced timing advance at acceleration.
Test driving with a vacuum-meter teed to the load compensator hose will show no "second acceleration curve".
The needle may hick-up when the throttle blade passes the ported source slot in the bore creeping away slowly with the car, but i would not call that hick-up "second acceleration curve".
Maybe this can be accomplished with some sort of delay valve for the load compensator?