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have you ever dove twinsets?
This question is very easy to answer. Sidemount tends to naturally push your CoG down, same with most rebreathers, so floaty feet are a non issue, backmount has the manifold up on your head so it is trying to push you face down. It is that simple, nothing to do with hanging below rigs, or being easy to align your back/thighs. Doubles want to push you nose down into the dirt, and sidemount tends to want to push your feet down. Don't believe it? Ask why a lot of sidemount rigs have trim weights on the shoulders for wetsuit diving and guys in twinsets are putting on heavier fins and use tail weights.... It's all about center of gravity and on sidemount it is around your hips vs twins that are up at your shoulders
This question is very easy to answer. Sidemount tends to naturally push your CoG down, same with most rebreathers, so floaty feet are a non issue, backmount has the manifold up on your head so it is trying to push you face down. It is that simple, nothing to do with hanging below rigs, or being easy to align your back/thighs. Doubles want to push you nose down into the dirt, and sidemount tends to want to push your feet down. Don't believe it? Ask why a lot of sidemount rigs have trim weights on the shoulders for wetsuit diving and guys in twinsets are putting on heavier fins and use tail weights.... It's all about center of gravity and on sidemount it is around your hips vs twins that are up at your shoulders