I don’t use spreadsheets to understand residue. However I was a very quick study, when one of my characters did a mining mission. You have 1 unique rock and need to mine 100%. You need a lossless mining laser on those missions or you won’t be able to complete it. Residue is what percent of the rock you lose in space. If there is 30,000 units to harvest and you have a loss 10%, you will return with 27,000 units and fail the mission.
Hmmm… Does that also mean you also get four times the lag in trade hubs? By Grabthar’s hammer… what a savings.
Have fun!