With a limited pump size it more important to have enough fuel at the hit and why they run clutches instead of 'glides, they run the clutches rather loose to keep the pump speed high. The downside is that the clutch gets extreemly hot and that transfers to the rear main.
If you dont have enough pump pressure/fuel volume at the hit, means that the power is down and you will go into shake
Never did care for the A/F class. I the begining it was touted as an inexpensive class to run Nitro and restrictions were put in to keep the cars at high 6's low 7's. They did a lot of monkeying around with it over the years but instead of keeping it at those numbers, the ETs have become lower and lower and a lot of racers/cars got parked do to cost. If people enjoy that type of racing---Great for them, but its a long and costly road