It might be very bad news. Oxtox occurs at different concentrations and durations for different people. The limits are set based on keeping almost everyone safe. Many people violate their mod, sometimes badly without a negative outcome but the result of a bad outcome is almost always very bad so we don't push it. The mod limit recommendation used to be 1.6ppo. It wasn't changed because everyone was dying and is still used for deco but if everyone went back to 1.6 there would be more negative outcomes and that's not a game we wish to play.