Still has a stumble/hesitiation

With the 67 jets in the front that it came with the A/F ratios where 12.73 to 12.85 at WOT and 13.56 to 13.78 at cruise. It was recomended I could go down 2 jet izes and if it didn't ping it was good to go. So I dropped down on the front to a 65 with no noticeable change.

The reason it ended up with a 750 Mighty Demon with annular boosters is I had a 650 speed demon and had bog issues off the line I couldn't get sorted out so the engine shop that built it loaned me a 750 mighty demon they had and mid range and top it where way better the bog was a little less but no worse so I picked up a new/used 750. I am starting to think vacuum secondary as my ability to tune the Demon's hasn;t been that great. I see a lot of guys runnign and liking the Holley 3310 750

I'll try the power valve this weekend but when I was on holleys website they said divide your vacuum in gear by 2 which is where I got the 4.5 from.