Can someone explain the arcane single target rotation for me? From what I've understood, its something like:
1. Keep Rune of Power up at all time
2. Keep Nether Tempest up at all time
3. Spam blast untill you get to 6 stacks, use all missiles proccs at 6. If you get 2 proccs before you hit 6 debuffs, spend 1.
4. Cast Barrage to clear stacks.
Yes, there is something you are missing. You don't want to clear stacks if at all possible. In my semi-crappy 485 gear I went all of LFR Spirit Kings and LFR Will without dropping stacks between mana gems, missile procs, casting NT on various targets, and occasionally throwing out a scorch for movement or to fish quickly for an AM proc.