I've been spearing for about four years now. Dedicated to the point of undermining more "legit" elements of my life. I have good technique and can dive to just over 70ft and close to 2.5 minutes. Most of my hunting is in 40ft water and my avg. time is 1:30-1:45. My best dives are when stacks of fish are schooling and my attention is theirs. I understand the dangers of diving over 2.5 but am a bit vexed that after this time and focus I still have not cracked 3 minutes. I realize lung capacity is set from youth and i'm 37. Is it tech, pysch or phys. Any ideas. Mahalo P.s. how much of a downside is it that I have to use my hand ala frenzel to clear when seeking more depth and time?