Seeing as so much effort is going into PC and Mob stat scaling, might I suggest having a Qualitative look at current Epic and Legendary content.

Why are we still fighting rats, oozes, kobolds, and other mundane mobs at epic and legendary levels ?

What's the point in increasing PC cap levels, if it's just to fight scaled up versions of the same heroic mobs ?

Shouldn't Epics be "Epic" and Legendary be "Legendary" ? Have a look at the mobs you propose and switch+spice them to be appropriate. It'll make Epics and Legendary content feel more memorable.

Cheers