No rim locks, yet.
The rear D606 I ran anywhere from 18 to 28psi, 90% of the time was at 25psi for daily riding. 28psi when loaded up for camping. 18psi once or twice on a more aggressive trail ride, not often.
Running 12psi all of the time in the MT43 now. If I go back to it I'll run a rim lock and run 10-12psi on pavement and lower off-road.