King Ranperre's tomb is an example of doing the mob placement intelligently, the higher level stuff is not likely to be stumbled on by a level 7. Problem is, they didn't bother with that as much with the new content. I'm about to be taking ranger up the ladder, AF is gonna be a pain in the ass, s/i or no with the new mobs in my way. Especially since you have to drop invis for almost every bit of it.