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As a channel islands spearo (shallow water mostly) we often want neutral at 4-5 meters. I was running an 8kg harness.
We then started to go deeper.
we use omer cayman 5mm and brown mimetic 5mm (both omer, both different bouyancy).
however...
when at vobster quay we soon learned we were way too heavy !
i had though 14lb fine in salt but i was running 2kg in freshwater.
i reduced weight to 12, then 11lb and another pound is still gonna come off before i dive again, maybe 2.
weight for bouyancy at 10-11 meters if diving below that and upto 20M i reckon.
fins down, arms up and exhale it all....... if you sink below your mouth your too heavy and its hard to relax whilst buddying etc..
And...
on your big exhale during a snorkel breathe up, you can gulp a chunk of salt if you are heavy.
being heavy makes crap duck dives look good too.
hope this helps but its just what we were shown, i'm no expert.