Mares Abyss vs. Aqualung ?? your ideas!

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h90

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Recently I went diving, but forgot my din/Yoke adaptor. As the DC didn't had one.....
I had to dive with their things (without rental fee, that was fair).
Mine is a mares abyss with mr22 and adaptor (you need less weight with that).
the rental one was a Aqualung, but I don't know which.
First I need one more weight with it.
than breathing was MUCH easier than with the Abyss. Well with the Abyss I breath almost like without reg on the surface but on the Aqualung I had the feeling I get air easier than on the land, even pressed into me.
The dive was very shallow specially at the end and we almost finished the bottles at around 5 meter and it got more hard to breath at the end.

Asking the DM: He told me on the shallow it is OK but at deep it is different as the first stage is not balanced, therefore it got more hard at the end.

So I am surprised that breathing was so extreme easy on the beginning--maybe I should readjust my Abyss??
I am surprised that there are still not balanced first stages.
I knew that not balanced stages change with the pressure in the tank, but why with deep???
Are Aqualung sooooo good?
 
https://www.shearwater.com/products/swift/

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