This link might help:
http://www.cxmagazine.com/going-tubeles ... mendations
This is one of the reasons why tubulars still remain popular in CX - you can run very low pressures, even bottoming out the tyre at times and yet remain puncture free. Obviously, in very wet or loose conditions, the lower the pressure, then the more grip you get.
I still train on clinchers, but haven't got around to trying tubeless on them yet, but my friend does. Tyre choice is a big factor - some makes e.g. Schwalbe are notoriously difficult whereas Michelins are apparently better.