The dying in cellar is the biggest issue with the profile / pathing of DB. Best fix, until i can come up with a solution is just get enough gear to kill sarkoth and not worry about dying. Use templar with healing and get around 20k dps with your DH. shouldn't have any issues.
Works like a charm! I sacrificed 10-15% GF for more dps and I pretty much clear the area with just cluster arrow. Potions also help too.