I tried this, but he gets stuck so much while questing that its too dangerous.
Questing until you hit a snag for any given level...then PRIVATE grinding profiles until you hit the next level, then quest again.....repeat until 90...Thats what I do anyway since questing is ,unfortunately, far from AFK 85-90. Making your own grinding profiles is rather simple, and its good, I think, to switch them up.