If your VA is plumbed to the proper spark-port, then my guess would be'
wrong /defective gasket on the metering block, or pouched parts, on account of; the primary throttles would have to be way far open to activate the VA; like 1600/1800 rpm far. Which with 18* of idle-timing, and 9inches of vacuum, does not compute, for me.
Maybe this is linked to the fat mixture; as in ruptured PV diaphragm or wrong PV gasket..
In any case, I would take the M-block off for inspection.
If perchance your secondary side has a PV, then you better check it too.