Just a thought, whenever I do any "testing" at the track like that I always use the "A-B-B-A" method, and only change ONE thing at a time.
In your case it'd go something like this:
1st pass, "A" setup. 40 psi fuel pressure.
2nd pass, "B" setup. 42 psi fuel pressure.
3rd pass, "B" setup. 43 psi fuel pressure.
4th pass, "A" setup. go back to your original settings, 40 psi.
Sounds like a lot of work, but you'll end up with more accurate data to work with. The more or less eliminates the bad hook/good hook type stuff. "Was that pass better because of the 42 psi, or did I just get ahold of the track better?"
MOST of the time at the track, this is not feezable, time doesn't permit. But when/if you can, this is the way to go for testing.
Just my $.02!
And yes, Jeff and Andy are the BOSS! LOL