Problem Running Elona Reach

I figured this would be best here since Dervish is not part of the Tyrian campaign so it would not make sense there.

Next is the problem. I can just about run this mission and bonus. Problem is the Mesmer boss. Or any boss for that matter.

The Mesmer boss loves Ethereal Burden...too much. I can't get away when he uses it because then the warriors come up and cripple me. If he is in one spot I can get around him and do ok but otherwise I die.

Also, when I go through the center after getting the priest on that side I pull too much and nothing stops following me. I know its the AI update but no matter what I do I can not get anything to STOP following me.

Any tips would be greatly appriciated. I will give out the build if needed but I want to keep it sort of to myself if I can since I am sort of proud of coming up with it.