resource depletion seems to use a different quality scaling compared to everything else. I set the game to have one extra tier of quality and scaling to be 2. this buffs other scaling but ends up with a mythic large miner having a 12% resource deletion rate and a legendary with 16% both being worse than a legendary miner in vanilla at 8%.

on further testing it doesn't seem to matter what you put the quality scaling at. even at a scaling of 10 it nerfs resource depletion rate on all miners.

Fixed now. The scaling thing was a bug, but the legendary miner being worse than vanilla is a "feature". Basically vanilla gives an extra boost to Legendary quality and by default this mod scales it back to being linear if you have extra quality levels added (making Mythic the equivalent of vanilla Legendary). I've also added an extra option now to keep that boost even with extra levels if you'd prefer in the settings.