Fine Tuning a 360 Magnum with a Brawler "Double Pumper"

This is probably a stupid question, but are jet extensions really designed only for the secondary bowl and only for hard acceleration? I’m asking because the other day at work I was sitting in someone’s driveway which was really steep and the truck was nose down, obviously meaning the primary bowl had the fuel all the way in the front, uncovering the jets. While I was trying to reverse out of the driveway, it was sputtering and it was very hard to keep idling, I had to basically run it off of the accelerator pump until I got back to flat ground where it went back to normal.

Would extensions help this issue or would it help this issue but if say I was on a steep hill nose up I would then have the same issue?

I also plan to pull the carb off to reset it tomorrow. I have a new cable and bracket to install so might as well pop off the carb and take a look at everything while I’m in there