The clip and line you are attaching to your chest Dring is called a choker. This is used only when getting entering and exiting the water. I use these for boat diving. You disconnect them once in the water and use only the bungee.
The way Edd Sorenson dives per the way my buddy was trained by him (in December) is with the choker attached for the whole dive. If you don't use the choker the tank could only ever hang directly at your side?
Since on the nomad the bungee is on your back, near your shoulder blades and runs under your arm I don't see anyway that the bottle could move forward at all without the choker? I used to dive with just the bungee but when my buddy got back from training he exposed me to the choker. This is how he was taught. I use the choker to keep it forward and the bungee to pull it tight and align the valve handle.
If I disconnect the choker the bottle could only move backwards towards my feet. I do know that some people do dive with no choker but in my case it seems to help. I suppose this is just a different way to dive sidemount. It's not wrong it's just different than how you dive. Thanks for the comments. I will keep tweaking and keep working on improving my skills. I do feel that my last pool session was much better and will hopefully continue to improve.
Stano