Ive been wrong before, and I may be now but I was sure vac adv was 0 at WOT. Only mech and at WOT. Ive had a few and still own a carbed. As far as how it all works and the way you explained it is correct and it makes since to think there would be vac adv at WOT but I beleive there was a reason that there wasnt any. I used to run my truck 73 F100 at the track with no line hooked to vac advance. Later down the road I started driving it daily and put a line on it. Got better gas milage but no improvement in times at all with the same base timing. I believe it only works at part throttle.
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