You shouldn't have a leaking problem when the tank is full. When you take a draw, the
juice is sucked up those channels from the outer section causing the wells to fill with
juice. The level of
juice in the outer section will drop at the same time. The air bubble above the juice will thus be bigger but at a lower pressure. When your draw finishes and the mouthpiece is released, the [low pressure] air bubble will suck that juice from the wells back into the outer tank.
Try fitting a clear M-tank and chimney, than watch what happens in a mirror. It's quite interesting and demonstrates the engineering genius of SvoeMesto's design.
The problem will occur when the tank is emptier, typically a third full or less. As the device is raised and the draw is taken, one channel may be in the air bubble whilst the other is in liquid. If the partial vacuum is not maintained in the outer (juice) chamber then the juice wells won't get sucked back after the draw. After enough draws, the wells overfill and spill down the airflow input hole leading to leakage.
I'd be interested if you can keep us all posted as to how the device behaves over time with the larger channels.
