Man I understand your frustration... it is how I learned "Holley 101".
Here is what came to mind:
The PV sounds suspect (too high maybe). This will be evident w/a vacuum reading... might help exposing any vacuum leaks too. Although my altitude is different than yours, I remember using 2.5 to 3.5 here depending on the variables. Check & make sure it is not blown too. I know that you have been through several adjustments on the carb. Can you go back to neutral settings & remember each change/outcome? If the signal to the power valve has changed... all of of your efforts are in vein if it is not opening & at the right time... plus it may be too high.
I had a needle & seat with the smallest piece of rubber do the same thing... end result is a hesitation, ring wash & fuel PUKE. Float level.... do you have sight windows on that carb?? Scoot