Apologies for the confusion here. Over the years the devs have shifted the Detail size values. If my memory is correct, the values in this course ranged from 10-30 px. However in recent years that same behavior is more in the 5-12 px range.
So I recommend trying:
- 12 px for broad sculpting (formerly 30 px)
- 8 px for medium sculpting (formerly 20 px)
- 5 px for fine details (formerly 10px)
See if that behavior better fits what’s happening in the videos.