I recently heard that in order to get an Aqualung i450 to match a computer using DSAT, set the i450 to 26% nitrox and it will be very similar to the DSAT. I am going to try it, I have both computers. The reason is that when two divers are doing a deeper wreck on air, and one that has the more conservative i450 will have much less bottom time before deco. Thoughts on the concept? Is there a "safe" way to make a Z+ algorithim more forgiving to match profiles with DSAT computers?