Would never recommend a Bellus on a Mech. Because Bellus RTAs are prone to leak through the AFC especially if you too fill.
The Bellus MUST HAVE A VACUUM so finger tight on the top is not good enough.
If you use a Bellus on a mech make sure it is always bottom filled.
Sounds like you need to pay more attention to your wicking, and close the airflow before filling.
Wicking is tricky to get just right, but once you do it's a pretty decent tank.
( also: change out the o-rings on the airflow for a better fit)
Zero leaks.
All mechanical.
Know your gear.
The Bellus is like an aromamizer with all the flaws corrected.
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