Did we ever get more details about how experience calibration works?

Did we ever get more details about how experience calibration works? I have had maps get 2500+ plays in first 48 hours and never reach calibration, or finally start awarding experience to only work for a few days before going back to calibrating status. Now i put a generic deathrun just to test a few new scripts, and it is calibrated and awarding XP at baredly 800 plays. There seems to be no consistency at all.