Honestly, I think this might be better suited for a bug report. But when being downleveled, your precision is lowered, but it takes less precision for crit chance, so it balances out. With crit damage it lowers directly. I have 75% crit damage at 80, but when downleveled I often find myself with 5%. This is 1/3 of the stats on my gear and it becomes completely worthless in lower level content. % increases shouldn’t be nerfed with downleveling.