I manage the 7" hose like this.
View attachment 154477
No need to retain it except to clip it to the right shoulder D ring when not in use.
I tuck the loop under a pouch on my waistband on the right hip.
I'm not sold on the idea of tucking the long hose under bungee along your tank, you can't easily re-stow it if you deploy or accidentally pull it out of the elastic retaining loops.
I like to practice deploying the long hose and going to my backup early on each dive. It ensures the hose is not caught under anything and also that my backup reg is functioning properly. As I can easily re-stow the hose this is easily done even if I'm paired with an insta-buddy I can do this without interrupting the dive whilst I get help stowing my backup reg.