Maybe try higher wattage, more open airflow and a softer pull. The Cubis is known to be a little "juicy".
Others may have better suggestions, I do not own one. Cheers!
Good suggestions by
@Hitmetwice...
I have heard/read a lot of people have issues with the Cubis. After having 4 or 5 in rotation between my better half and myself for over a year without any major problems, just leaves me scratching my head. We've gone through 30-35 of the .5 SS coils with only 1 or 2 duds. We both vape eVic VTC/VTwo Minis in TC (custom TCR 135) @ 23.5-27.5w/450F airflow wide open and are quite happy with the
tank/coils performance. We used the 1.0 SS coils for a time with good results but preferred DL and found them too restrictive. If memory serves, we vaped those coils @ 17-20w. Some other things to consider if/when having problems:
Don't over prime the coil. 4 or 5 drops & a few primer puffs should be good.
Check that the o-ring on the chimney is in place.
Make sure the coil is attached squarely & securely.
Don't over fill the tank.
When leaving the tank unused for a period of time/overnight, take a few strong primer puffs with the airflow wide open before firing.
Let off the fire button just before you finish your draw to reduce condensation that may drain back into the coil.
I hope this will be helpful...