I posted that in a hurry just as I was leaving work. The 14* part was a typo. But, I recall setting a low initial, THEN locking the timing out and the lock out added a sensible amount. I'll run this test again to be sure. My point is, the total mechanical advance wasn't in the 50* range.
Just checked my balancer with a known good unit and it hasn't slipped.
Re. Vac advance, it's a stock can and was disconnected for the chassis dyno anyway.