The Cerberus tank is designed for a Dtl inhale method, trying to use a Mtl inhale method with just about any delivery device/tank designed for Dtl is going to give harsh to very harsh hits.
Doesn't matter if you use high Vg % or nic salts as a way to smooth it out.
Using Mtl inhale on a Dtl 'tank' you are defeating and rendering the tank/delivery device cooling system useless, end up with harsh sometimes hot vapor.
Mtl - steady light to medium strength smoother longer inhale, similar to taking a drag from cigarette, collect vapor in mouth then either inhale or blow out without inhaling.
If this is what you like best you need a delivery device/tank designed for Mtl vaping.
Dtl - strong rapid deep inhale, moving a lot of air through the delivery device in a short time, pulling the vapor from the delivery device directly into your lungs.
The 12 mg/ml nic in a Dtl delivery device is also considered high which will also increase harshness. Most folks use 6 mg/ml or less with Dtl.
If you want to vape using a Mtl inhale method ( smooth light to medium inhale strength collecting vapor in mouth, then either inhale or blow out without inhaling ) you need a tank/delivery device designed for Mtl vaping.
Innokin Zenith or Zlide would be two good examples of Mtl tanks / delivery devices.