Just wanted to post a resolution to this:

Root cause was stupid ATI balancer had too much press, did not seat against the reluctor causing it to rattle and wallow easily a new keyway width in both directions... so during accel probably had significantly retarded timing until it bounced forward and gave some advance. Also giving ford [censored] for this too as who uses a stupid stamped steel reluctor that engages on the keyway anyways, this is why other modern v8s like the LS's and Hemis have a large pressed on reluctor as part of the crank.