Not too experienced with hunters,but my obvious outsider's suggestion would be to take advantage of their high RoF and try getting some novas/sharpnel/etc in there.If your stats will allow it,of course.
Now alternatively,you could try the cc route and get some stun attack strength mods (getting a +x stun attack strength augment would surely help on that front too).Again,the high RoF should make them into quite the tools for retreat in solo or a few seconds of clean hits in parties.