I always thought Healing Wind was based on VIT or max HP. I say this because pre 1.19 when you could stat allocate I would put almost all my points into Vit for the cap at each lvl then put the rest into Dex. And Healing Wind would always heal more for the more vit/hp I had doing a lil less then it does now but now I have 169 Mnd and bk then I only had like 13