For filament, it is onften usefull to uncheck “slow printing down for better layer cooling”, specially on small part, this setting can result in banding, because some layers could be layed with higher flow/speed than other. (you can re-enable it if if you have tiny parts to print or low cost PLA that cure too slowly)
Also if you ar using good filament other than bambulab you may increase the setting “max volumetric speed to 20%”. (PLA default to 12% when it is not bambulab filament…)
Another thing I found useful (but not in filament setting) " is to reduce “infill/wall overlap” setting from 15% to -5% (yes there is a minus sign)
Last thing is adding a thrid wall, setting 3 rather than 2
Reducing infill overlap and adding a third wall give you better chance that your infill does not affect outerwalls quality.
Kepping a constant flow by unchecking “slow printing down for better layer cooling” also help for outerwalls quality to be all layed with the same speed/flow
EDIT:
I will try to replace missing pictures in this thread if I can found them or similar image 