fighting anything above your level takes some work - good weapons and good tactics. Static weapons are good for taking down shields - try that. I found that a high fire rate/high accuracy shottie did great. my vitrolic crux did great on them as a casutic gun - takes out the Lancer vehicles in a few hits as well.
Lemme know when you'll be online- I'm off for a few days but have family staying with me. If I can shoo them out the door I can get some play time...