If you insist on going in with light armors, then I would suggest upgrading your troll leather leggings to a higher tier armor and max that out. A second bow on hand wouldn't be a bad idea, either. Other than that, it looks like a perfectly fine loadout and you've put some decent thought into prep work.

If you're going primarily with archery, then Needle, obviously. Poison arrows can potentially do more damage [26 Pierce+52 Poison versus 62 Pierce], but the DOT aspect of poison will require sticking with a slow rate of fire (otherwise the poison can end up being rather wasted), which, of course, is not a recommended plan. If you have a limited supply of Needle arrows, then I would say Obsidian for your backup arrows.