I had 0 points in both poison arrow and stun arrow. There are some lvl7 golbins around, where you should be able to clear them and reach lvl7 or 8 without much trouble. Just pull them off the main horde and you should able to kill them without much trouble.
Completed side quests is not a must, as by just clearing mobs in the wilds, you can get all exp you needed. Once you reach lvl7, you should be able to get your ranger stealth, then it will make you pulling job more easier. Try get your necromantic creature asap and that will help as well.
And as far as I know, ranger strength wont increase magic damage of the bow, unlike other weapon mastery passive which do. As long you are good with shoot and run, you shouldnt be having trouble in the area.
