Don't run forward after you shield lob, because if the healer does something like blows an aoe heal, they can all run past you and after the healer while your Flash is coming off cooldown. If you shield lob at maximum range and wait for them to run to you, Flash will be off cooldown by then and you can snap a flash to save a healer (don't ask me why healers do this, but I've had it happen to me often enough to learn this lesson).
If your goal is to speed pull, then don't shield lob at all. Just run forward and Flash.
