Sorry, I've been there. You'll get through it.
I have same displacement as you, stump puller cam, and '65 tri-power. I modified the idle circuit same as you, and my jetting is 74-64-74. It all works good. Warm idle at 14.5 AFR. Cruise at 14 AFR. WOT at 12.5-13 AFR. I needed a stiffer torsion spring on the rear carb as it wasn't closing fulling after actuating them. Good luck!
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1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
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