There is currently a bug with the way WoD enchantments scale in timewalking dungeons.
Characters with fully enchanted gear (neck, back, rings, weapons) will have about 3x the amount of their main stat than without the enchants.
An example to show the difference in scaling: The basic +89 crit on [Skullcracker Cloak] gets scaled down to +8 crit. Meanwhile, the +100 crit enchant on cape will only lose 22 points, being scaled down to +78 crit.
TL;DR: Enchant your gear with WoD enchants, faceroll through timewalking dungeons for Hellfire Citadel caches.