I get a hit but the depth varies subject to conditions and how dived up i am, dived up is not about building up a resistance, but being on top of your equipment and diving skills through recent use.
In quite poor viz on the Salsette i had a hit like a single whiskey at about 38m, diving the Cuvier at the same depth in good viz i get nothing noticeable.
At about 44m i get a bit more of a hit like a 2nd drink, on the Warilda at 46-48m with 20m of viz i could feel this, it was expected and i knew what the threat was so it was not too much of an issue.
On the Sabac last year in a darkish 50m the double whiskey was there as i watched a Trimix diver struggle making a simple mistake while backing out of a corridor, on the Anderman a few weeks later i had a stronger hit at 44m and did not go to the planned 50m
I get narked and i know it, i know what to look for and feel i control it reasonably well. I make mistakes but i do that anyway
i always remember the dive though
As for CO2 hits, i have had raging headaches several times usually at shallow depths (25-32m) when a current has been running, and i have cut several dives short due to this. For me its much more of a problem than the Narcosis, i've never binned a dive due to Narcosis but i have binned several due to CO2 hits.