Sure, here are some references.
Aquanaut's mailing list archives.
aquanaut.com
This forum is for the discussion of incidents that are near, on, or under the water that divers can learn from. The main objective is to make us all safer. See the Special Rules. Please post your surprise, indignation, or memorials in the Passings forum. Old name: Old merged forum name(s)...
scubaboard.com
If you're looking for a formal quantitative risk analysis then you're not going to find it. There are too many variables and the source data is limited. But if you spend enough time reading through the archives then the risks associated with deep air become pretty obvious. It's usually not the sole cause of a tech diving incident but often a contributing factor.
I'm not sure what point you're trying to make with that EAD calculation? Nitrox and air are pretty similar in terms of gas density and narcotic effect.
The WOB and hypercapnia concern is more a matter of respiratory physiology than regulator quality. As the gas density increases airway resistance goes up, and then if you really have to exert yourself (like to handle an emergency) you can exceed your ventilatory capacity. Any decent regulator can deliver enough air to keep you
alive way deeper than 100 ft. But the ones that are designed to deliver exceptionally high volumes of gas also tend to be more finicky and likely to free flow. Those should be avoided for back gas; save them for stages where free flows are less of a concern.