I had the Bonty ACX’s fitted as tubeless in September, rode Dalby at slightly lower pressures than I’m used to and they were a revelation. Not once did they seem to slide on the small polished stones that can catch you out there and they weren’t too slow either.
I tried Conti Verticals and found them unpredictable when they do break away, especially at the end of a down hill section if there’s mud in the eqation. I have them still on my FS26er from riding Snowdon, but they’re draggy.
I’ve tried the Panaracer XC Pros and they’re fine – a popular tyre.
In the summer it’s RRalfs.
I’ve had a love / hate relationship with NNicks. Maybe I should try the side-wall reinforced ones as mine never lasted and punctured all the time.
If NNicks work for you, they’re about as close as you’ll come to an all-year tyre that I know of.