UCFDIVER, The reason for the difference in burn time vs real time is that because the batteries with 12.5 amps are being tested with a 16 amp tester and therefore the higher load shortens the burn time. If you have a 12.5 amp tester this would not apply. However, make sure you understand the risks of testing these batteries as described above. Hope this clears it up. PS. I have nothing against Gavins (quite the opposite really) as I have had several and dove with, and have been friends with George for about 20 years. PfcAJ the Gavins are sometimes purposely different speeds as the ones George made for me, he said, were always the fastest version so I could fly when I dove with him. Divers experience and ability affect speed greatly of course as well and video can help identify if you are going slower the possible cause if not mechanical. Often times it is caused by someone releasing the trigger repeatedly rather than keeping the hammer down and staying smooth.. or having legs too wide or too high, too low, etc.
Errol