I ran the Rekon Exo+/Dissector EXO combo for a summer, south of England, tubeless, no issues. 18 front, 20 Rear, I weigh 75Kg.
When the autumn mud came, the Rekon would just spin out, so now run DHRII EXO+ / Assegai EXO+. For bike parks and sharp rocks / faster rolling, I run 21 Front, 23 Rear...