Yep, if it's an Istick, dial it down. If you can't as it sounds like, go to a higher res head. Watch pbusardo's video if you're curious about the quirks with the Istick
And have modest expectations for the Kanger low res coils. From what I can see they didn't make any changes to those coils that affect their ability to wick, and they can't do it fast enough with the airflow allowed by the AT Mega and high heat levels. In my experience at least.