reading plugs ain't as easy as it was. gas additives and the wide variety of temp ranges makes reading plugs really like playing the blind chicken
if you're sure your spark plugs are the correct temp range for your motor, and you sure your gas ain't contains those additives that turns the plugs almost blueish, you can dial in more fuel.if your electrodes are anywhere from light brown to tan, or even light beige, just leave it if you ain't getting other symptoms like lean surge or overheating or such