It kind of depends on how much of the content you do.
I'm consistently 4-6 levels higher than the quests I'm on.. I've only played a handful of warzones, and done 2 flashpoints. I do however finish every quest, every bonus quest, and every heroic in the zone. So now I just stealth through everything hoping the quest level with catch up with me a bit. But there are just so many quests it's ridiculous. (in a good way) Taris is insane and if you complete everything you will be way above the quest level.
I'm on Nar Shaddaa now at level 27 still finishing up the level 22 quests there..