Well I have good latency to my new server (Red Eclipse) but still lag spikes.
I would point at a severe overcrowding of the server for that.
There were 60 people in my Explosive Conflict instance, and another 40 in instance two.
My guild died a lot at Kephess HM, just because we got server lag at times where movement or quick actions were mandatory to survive.
I hope Bioware gets their server load under control, OPs are far less fun if its like this