dumpsterDiver
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I've only seen that 'as standard' on sidemount systems. It's a good, direct, solution for trim issues. That said, the same result can be obtained using trim weights on cam-bands, proper weighting and some study/adjustment of body positioning.
Well cam bands put the weight in a non optimal location. Clearly if you want to have a bias for a face down horizontal position, that ballast is best placed low (like a keel) in a sailboat and the bouyancy needs to be higher up.
When diving with a thick 7 mm wetsuit in cold water with multiple layers, i rigged a 2-lb bullet weight into each shoulder strap and it helped but was not real comfortable.
Something that is very effective for the head up problem: I've also used ankle weights placed around the neck of the tank valve on aluminum tanks to get my head down when i really needed it.. when commercial golf ball diving, which involves running on the bottom and being weighted so you are constantly tipping forward and stumbling along the bottom. Always wore some non-ditchable lead around the tank neck/valve. That really is a very simple solution.