Unless I'm missing something the brush loading setting seems unbalanced in AR6 making it only really useable from 90% upwards. It seems like a bug as from 60 and below we just get the same single sample of the brush head stamp.

Click image for larger version. 

Name:	Screenshot 2019-07-18 at 09.33.46.jpg 
Views:	5 
Size:	98.6 KB 
ID:	97787