When I screw on the chimney-chamber section without the glass, I'm able to fully screw it down. When I try it with the glass section fitted, there's one whole turn that I'm not able to complete due to the fitted o-rings.
I'm convinced that the leaking is caused by the chimney-chamber connection because whenever I fill it above the connection, I get waterfall-styled leaking.
At first, I thought the top airflow had something to do with it meaning when the slots are open, it may or may not cause a disturbance in the pressure within the tank. Then however, I recalled my issues with the original Griffin which doesn't have top airflow and yet it leaked nonstop until the liquid level passed the chimney-chamber connection.
I really don't know what to make of it. I wouldn't call myself a newbie when it comes to RTAs as I've been tinkering with them since the first iteration of the Taifun GT. This tank (or rather these tanks) though is keeping me puzzled.