Did we ever figure out if premium cubes are better from rare-->epic?

Personally I wouldn't recommend cubing anything until Nexon really fixes the "display glitch".
Why cube when you can't be sure what stats are really on your item (and, moreover, what they will be after Nexon "fixes" them)?
Especially when there's no sale on cubes right now, so really no rush.

Black Friday is not to be counted on, obviously, but they might put cubes on sale as an apology after the glitch is fixed (I know, "keep dreaming").