This is just information as to why the brush is transparent, as I remember that when I tried this brush for the first time in CSP I didn’t understand very well how to use it, then I understood its use better over time.
edit
I made adjustments again
the start was making dots so i made its size different over distance and time. and tried to make it a bit more transparent. but you can always lower the opacity or go back and erase with a soft brush.
I know this is old but I wanted to thank for the brushes as I had gotten a Wacom One and it came with a free trial of CSP and I loved the brushes but when I went to save it wouldn’t let me. I went back to Krita and was sad about my brushes. Thank you!