I think the pressure on the white balls is higher because there is a part (J) where there is no balls between each white balls. So the result could be more negative.

I suppose the sum of forces at 0, so I need the parameter 's' with the container alone so I added the parameter 's' but now, with the object I can't have the sum of forces at 0...

I found the sum of forces at 0 in the containers without the Object X.

But not with the Object X.

I verified my calculations and I corrected a little the values. I take in account the area the green line don't attract. All in the device is static, nothing moves, it is the sum of forces that is not 0, so all the device can create or destroy an energy and move the CG alone.

I need to add a thin tube for each white disk to allow the pressure  of blue disks to be transmitted below. This lost a little.

If that can work like that, it could say it is possible to have a up force of buoyancy higher than the volume of water (under gravity with a container and water), and I don't need disks just a shape like I drawn. Block the parts between disks with a wall.