Skip the Dark Crystal and focus on buffing the Imbued ones. It's simple, if you have the gold to buy or loot the dark crystal base which is well over 10m for a set, you can definitely afford the recipes too.

Raw comparison is not helpful in this situation. You've left us upgrading L36 mythics for three seasons so naturally, most of us have supergemmed each and every slot months ago. That means the extra +6 main makes the damage difference minuscule. In addition, it means that we're only going to swap to specific types of gear (Assault/Will, Potency/Brutality, Brutality).

I also agree they should be looked at and improved as sets. Warriors are getting +300 armor with no damage trade off or any other noticeable downside, for the matter. What do the mage and rogue sets have to show that'll be worth spending ten times the gold needed for a mythic set?