Great trip report! I've been hoping you'd get to Cozumel! 26 tanks on an 8 day trip is great and a heck of a pace. Good on 3Ps for their part in making that happen.
I dive a Suunto Mosquito computer. It's very conservative. My air consumption isn't horrible but I don't dive Nitrox to extend bottom time at depth. The purpose is to keep the computer happy. The Cozumel strategy I've used (it was suggested to me by the dive op) is to dive air on 1st and 3rd tanks of the day and nitrox on 2nd and 4th tanks. As 1st and 3rd tanks are generally deeper and often on walls, diving air means no need to worry about MODs. As 2nd and 4th tanks are shallower and tend to have a hard floor, the MOD for 36% isn't an issue. Long ago, I requested 32% but it was suggested to dive 36% as it costs the same and there's a little NDL benefit over 32%.
This strategy works for me and my computer, and cuts the nitrox upgrade fees in half. Years ago on a Belize trip I dove air only, and due to weather was only able to dive 4 tanks a day once. By day 3, NDLs were severely limited.
Thanks again for the great report!!
Were you in Cozumel in June of this year? I met someone at breakfast at Jeanie's that had the same nitrox strategy. I thought I would try it on my next visit.