I've run into the same problem. Popping is not rich, it's lean. IIRC there is a max PW size that needs to be increased. Then you'll probably end up reducing values in the other two tables.

You'd think the high pressure cal would be closer but the high pressure 454 had a TBI specific manifold which had a smaller volume than the old carby manifold plus adapter.

Increasing spark advance or changing the spark retard limit can increase how quickly the engine accelerates which in turn draws the fuel/air mix out of the manifold before it can ignite.

Edit: Yes, the maximum Async pulsewidth value will limit total AE.