Holley/Demon Carb stumble

What it sounds like to me and i can feel it in the car, is a slight baug stumble, then its off to the races.
The big fall on its face is not there anymore because i using PRH slower full throttle stomp.
You can here the eng stumble for a fraction of a sec as the front end is all most at full travel. then it gone.
Go back and watch from 3:10 to 3:19 focusing on 3:18 to 3:19 it fall flat then comes back on.
That run shows it the best