Just wondering if maybe we could have him non aggro to trolls and add a blood source there. As is south of TV as far as I know ( and I quite possibly could be wrong ) there are no blood supplies nor any fall back points until you get to around TV and that's a long ways to go.
I think a bigger problem is the lack of any blood source in between the 4 Kings patrol and Gatekeep. Put bowl in southern Gap and give us a couple of mobs in the area; also, add a blood source at the patrol in the cut around TV.