Carbineer Archive

I am at carbine 4/4/2/3 and have been trying to play around with various tactics for PvE play. I usually solo or in small groups (5-6), but I find that I usully stick to spaming fullauto2 or burstshot two. I was just wondering how some of you more experienced players use the various ablilites of the profession. I would really be thankful for any ideas you guys could spare for a new carbineer.