Here's something for you to check.
At idle look down the carb two front barrels and see if fuel is dripping from the two boosters I circled in red.
If you have ANY fuel dripping from these at idle it's because there are a small brass plug with a really small hole (air bleed) in the back side of these that gets plugged up with age. (most people miss this)
When the air bleed holes in the brass plugs get plugged up the idle vacuum is enough to pull fuel through them.
The holes let enough air in that at idle they don't pull fuel.
This would severely screw with your idle mixture and make the idle need to be higher to try and compensate for the extra fuel.
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