Ta. Edited. My training/instructor made the point that a lower GF-low will mean that you're still on-gassing in the slower compartments even though the faster compartments would be off-gassing, which has the effect of extending your overall deco time as it's the time for all compartments to get below the bubble generation level. Your point about diving to whatever suits you is well made. I've done a lot of deco dives over the past few years and found that 50:80's worked for me, with the exception of the tiredness. Changing the last stop depth, extending the final stop, or coming up really slowly seems to have fixed that. @nickb - what's your final stop depth? Do you add on any extra time? What's your final ascent time from the last stop?