I need to make sure you understand that pressure is not the true indicator of enough fuel volume delivery, if it is running out of fuel at 3/4 to wot in high gear make sure the needles and seats are big enough to flow enough fuel into the motor to make sure it isn't being starved by them
I had that happen on a new Holley list # 9375-3 1050 CFM dominator carb, the factory sent it out with one .110 needle and seat in the primary bowl and the secondary bowl had a .120 size in it. It ended up needing .120 in both bowls to not run the front cylinders out of fuel in the 1/4 mile
Lots of things can influence are results