Hey, welcome to the forum.
Some of it will come down to species. Woods like maple and walnut char less than something like zebrawood or cork.
I would suggest using best practices, cut hot and fast generally leads to less char.
This should help you zero in your settings:
If you tell us what species you’re using we might have more tips.
Also in cases where char is unavoidable, you might want to look up the salt cleaning trick.
If you’re talking about surface fouling (not charred edges) you may want to invest in some masking.
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