What I have found on both B,RB and 426 Hemi motors with all GOOD rocker gear and pushrods is new parts wear in requiring several adjustments until they wear in and are seated. Once they do that I check them once or twice a year depending on how many runs are on the motor(every 50 to 100 runs?) or when I hear one needing attention
Many years ago I would check them after every race cold at home before taking the car to the track for the next race, once I found out which GOOD parts to use that stop