There is no real setting for idle mixture screws. Every engine is different.
This is where you'll use that wideband to find a happy AFR for idle tuning. This will overall change the fuel curve throughout so I'd start there first.
Experiment to see what your engine likes. It might idle fine with 14.0 AFR, or it may want 13.5. Either way that's a bunch leaner that what you are currently showing. So that will lean out the curve everywhere. Test drive and see, change and repeat.
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