[hteas]

Eric,
You mention CO2 and narcosis. Are you really relating them? I am asking, because Keller and Buhlmann claimed that Keller was able to down in his diving barrel to 400 ft breathing either 5% or 10% oxygen (depending on whose story), and the rest nitrogen. Nobody since has explored tha possiblilty that it is the CO2 that causes the narcosis. Any thoughts.
Have you tried a dive skin to help with the cold? A skin shouldn't increase the buoyancy the way neoprene does.
Howard Teas