Tanking pre and post 2.1 with Gryphonskins. Don't seem to see a problem there. There hasn't been a content that requires more HP than what iLvl 90 + Gryphonskins can attain. Bar exception like if you want to solo tank EM Titan, you'd need all of them iLvl 90 and as much Vit as possible. Tried solo tanking EM Ifrit. Not possible...