Sounds like you are going in the right direction. My combo may have more comp ratio and cam than yours but on my 6 packs I am now at 79 jets on the front, 68's for center and 81's on the rear. I also went from a 6.5 PV to an 8.5 PV which eliminated a hesitation when I mash the gas. My timing is straight mechanical, now set at 12' initial and 36' total all in by about 2,800 rpm. Keep at it and make notes of ALL of your changes so you can go back if need be. I keep a hand drawn 'diagram' of my carb and jet positions and every time I make a jet change I cross out the old number and write in the new one.