Hmm, not sure what you were doing with a sneak character to be killed all the time, but different builds handle differently. Personally on my sneak builds I avoid having a follower as they totally ruin the sneak perk with their noise clomping around. Daurgr are easy with a sneak archer or even with a dagger with the right perks. I would kill them before they ever even woke up outa their coffins. You might wanna also run away more often and then come back in sneak mode when you get caught. I did have a few issues with some of the more powerful bosses finding me early on before I learned to move from the location I was attacking from. They always home in on that location. so as one of the guides points out, shoot and move about 10 meters way, and then when you are hidden go back and repeat till dead.