My first WSG'sFollow

Hello all. I did my first WSG's this weekend as a 48 lock. Here is my current spec. http://www.worldofwarcraft.com/info/classes/warlock/talents.html?0502220511231115512000000000000000000000000000000000000000000000

I was wondering what I should be focusing on doing in BG's. For the most part I played defense and protected the flag runner. A few Howl of Terrors and fear did wonders for letting a flag runner get ahead. Also did some diversionary tactics, run in, fear a few guys, DoT a few up and run out, then the main force snuck in a different way. Playing the middle seemed to work well too, just killing whoever I saw. Then protecting or killing flag runners from there.

For the most part my style was DoT them up, then either drain life for nightffall procs or searing pain. Using Death Coil for Howl of Terror and Fear mostly for defense only, or if I got in over my head. i didn't seem to die too often, but didn't always get a lot of killing blows. Is this normal fo an Affliction lock.

I am aware Dest would probably be better in BGs, but don't want to switch because I'll lose Instant Cast Howl of Terror, and I love Afflic for levelling and Instances, which I'll be doing again soon.