I own a Cleito, and have experienced the same vapor-locking issue as have many others. I work as an engineer, so perhaps that gave me a leg up in solving the problem.
The issue is NOT the coils. It is the tank itself.
New coil, properly primed, tends to last up to a week (average about 2 days, in my case) before the first vapor lock incident. This is because the wick is new, good, and retains a nominal amount of liquid. Once the liquid primed into the coil has been depleted, the first vapor-lock incident is experienced by the user. That first incident also causes the portion of the wick in contact with the coils to scorch. Once scorched, the wick is no longer able to retain the amount of liquid it originally did. From that point on, the user's best resolution is to unscrew the top cap to equalize the pressure within the tank. Wick re-saturates; but since it now no longer holds as much liquid, the user only gets a few good draws before the wick dries out again, forcing the user to "purge" the tank yet again. Cycle repeats itself until the user blames the coil and replaces it.
This seems to confuse a lot of users, and almost confused me, into thinking Cleito coils were poorly designed. The truth is, the coils become victimized by the faulty tank design.
My resolution is: When using the Cleito, I keep the top cap unscrewed throughout the entire session, even from the first time firing a new coil. After a week of usage, I notice the coil finally begins to show some mild carmelization. But now, I'm replacing coils every 2-3 weeks, as opposed to every 3 - 7 days.
The key thing to note is: The vape-locking occurs from the very first firing of a new coil. Users just don't notice it until the new coil's first soaking finally dries out. That fact seems to be masking the real cause of the issue.
