A few things come to mind to try out. Traps are always useful for powerful opponents of course. Be sure to focus up before starting firing anything so you're maxed out with focus and get the crit buff. If you're in Strength stance, hit your target with Quick Shot first, which will put a slow on it, then Barbed Arrow, to get a bleed going, then Penetrating Shot, then Swift Bow to refill your focus. Remember once the orc closes, you can use Scourging Blow to remove the BA bleed, do a nice bit of extra damage, then fire another BA w/no induction to get another bleed going. Don't forget Intent Concentration to refill your focus if you need it. If you're daring, you can try setting your trap just beyond max arrow range of the mob, move in front of the trap, get your first volley of shots off, then back up as the orc gets close, trap him, then move back to your max again and get another set of shots into him. Those orcs are tough to solo on-level, and that area is full of mobs too, many standing within aggro range of each other, so be careful where you set up and what you take on. Always clear the area of the normal mobs before engaging the elites. Some of the later quests out there will be very difficult to solo on-level, (killing the trolls/bone speakers, etc.) so you might think about getting one or two other players/kinnies to help, or wait a level or two and come back. Good hunting!