nereas:If you are planning a dive to 130 ft then your best mix would be TMX 25/35. You really should not be diving air deeper than 50 ft. And I would not dive nitrox deeper than 100 ft.
Is this a typo or a joke? While your suggestions would provide an added measure of safety, I think they are very extreme. A 50 ft limit would be more conservative than PADIU's OW depth limit.
Although I would hardly recommend it, I know a number of divers (myself included) that routinely dive air to 150 to 200 ft. Of course all of them are very experiened divers. Not something for most divers, but not unusual for those with the experience and equipment to do so.