Is this chart taking into account finished items with touch ups, or just parts, or everything together? Or is there a translated version. Better yet would be a chart that separated the +3's from 200-500 quality. +1-2's are so easy to get the only thing that matters is to see if it effects the +3 rate in any noticeable way.
The increase from 300-500 quality is so negligible it still seems the theory of stopping near 290-300 and saving the rest for durability touch ups and/or finishing the part is the best way to go.
