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Guest
My 19 cu ft pony bottle will make me roll to the right when I'm perfectly still.
Very easy to manage if you are using a weight belt. In warm water, I use a belt with 2 to 4 lb loaded just in front of my hips. With or without a pony, I counter such instability by rotating my weight belt a bit.
[/QUOTE]I added an AIR2 to my rig which now serves as my second if I'm air sharing.
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DD also uses an Air2. An Air2 and a slung pony are competing for the same space. I went from tank mount to sling mount because it was easier to configure. Then I went from an Air2 to a bungeed octo to clear up my left side a bit.
But there are many ways to skin this cat and most will work OK.
One word of caution. If you go with valve off, it is good to recharge the reg occasionally so pressure will keep water out. It will become a habit, but be careful that your hand is on the tank valve and not the yoke knob.