These "Mold" "Quality" "Rarity" values means their multiplier Sword value is Mold*Quality*Rarity*1.2*lvl bonus When you upgrade polisher/molder/appraiser you increase the chance of getting something better, but also don't decrease the chance of still getting the most common things Index just show you normal chances
when grinding do re enchant and then press the quality upgrade, mold upgrade etc...