I switch to low conservatism after using it on about 50 dives. My NDL clock was quicker than my colleagues. A couple of times I was given a 6 minute safety stop at 6 meters while my dive group completed only 3 minutes. I monitor my tissue compartments graph during and after the dive. I also take a bit longer surface interval where possible.
Could it be that the Medium setting is the factory default setting chosen by subject matter experts and lawyers?
GJS
it could also be the setting on the safety stop, there you can choose how many minutes you want it to tell you or choose adapt setting. with that setting the time can change (havent seen any other computer with this option).