You guys like to be sinking by 30 feet? Just asking as this seems to be what core is implying. I like to still be somewhat positively buoyant at first 10 meters. Neutral to negative the next 20-30 feet and free fall at about 50'. I am more of a safety geek as most of the times I dive without anyone watching.
I can usually stop kicking during my ascent at around 25' and will float to the surface. Of course, weights can be adjusted depending on depth.
Nice fish.