And I will answer your question from the other thread too.AquaTec once bubbled...
if the movement of air is better than those damb bungies tell me why specificly
It is mostly about minimizing drag but has to do with balance too.
Without the bugees the wings lay flat against the tanks producing minimal drag... and it is easy to tip a little to one side and let air go from one wing into the other to balance out what would otherwise be an imbalanced load. So you can have all your deco cylinders on the left side where you can manage them with your left hand while you run your scooter with your right hand.

But then I have never loaded myself down with a bunch of 80s rigged at right angles to one another so I suspect I might not fully understand how or why you are doing things.
Looking at the picture you posted in the other thread though... I see you are not rigged to move through the water with minimal drag in horizontal trim... is this just for bouncing down to a certain depth and then ascending back up???