Six pack secondary paper clip test?

An engine that was pulling harder would open the secondaries sooner with the same springs.
At least I think so.
With the AFR going up and down so much - especially when the secondaries begin to open - the engine just wasn't calling for more air.
In fact we can see with the yellow spring that the vacuum drops above 4750 rpm. Its was actually going closer to atmospheric than when the throttle is floored (around 3800-4000 rpm). So that suggested the engine wasnt using that extra airflow effectively.
I've got it much better now but don't have any logs comparing the various springs. Almost did. Brought the springs with me to the dragstrip last fall but only get one pass in. :( Time to go home. Maybe this year.