I see you are level 46 and leveling still. In this case the problem isn't in your gear so much as in technique. Your aim should be to not get hit. Pull at maximum range with roots, then starfire till it breaks, root again, run back to max range or there abouts, starfire away then root again when it breaks etc.
If you pull an add then either run away (travel form or catdash FTW) or if you can, root one, pop barkskin and kill the other one (while it is beating on you).
Good luck with leveling :)