I do not personally see any value on doing deep air to feel narcosis. I start recognizing it around 50ft be it cold or warm water. So diving to 100ft on Nitrox and then on trimix will give a good idea about the difference between the two. And I do not believe those who say they are not narced at 100ft
Possibly it's because I am used to drinking pretty hard and used to a good buzz???? But I have never thought I felt narced at even 130ft on air. I certainly haven't felt narced on shallower dives. I have done a bounce dive down to 182 ft in COLD water and I didn't feel narced then either. I felt as if I was in total control and very aware of my gauges and what I needed to do to make sure I didn't hit the need for decompression. I'm sure everybody would agree that at 182ft I MUST have been feeling narcosis but I had no feeling of confusion and knew what I needed to do. I guess some people must experience narcosis different? I haven't had that much experience that deep so I am open to the idea that narcosis may be quite a bit more disabling at that depth had it not been a bounce dive. For those with more experience... with more time at a particular depth does it become more disabling (let's say 10 minutes at 180ft instead of just a bounce)?
And yes I just signed up for AN/DECO and hoping for trimix soon after so I have not and will not make a habit of these deep dives. Just a little experimentation to learn a little on my own.