99% of players use Low level wands over High end wands because of the built ins
Diabolic Wand's 5% armor spell bonus should be on all wands. NErf the Diabolic Wands ASB to 2-3%.
AOE Size on high end wands is not at all useful as Armor spell bonus, Cast Speed, All Magic Bonus, so players are going to use low end wands over high end wands.
Diabolic Wand has 2 AMB 2 CAST 5ASB making it king of wands.
Knowing ej he will probably just nerf Diabolic Wand but I say just up high end wands.
The below images are some suggested changes to make end game wands more useful