This has already been discussed a while ago. The only times where PLD were the "mitigation king" was before 2.1. After the WAR fix, it ended. Yoshida is pretty much the only one still believing that PLD is the "mitigation king" or something like that. All of your calculations are good and have been done a while ago. That's why we insist that PLD needs a buff. They're the worst tank in every domain, literally.