I tried a lot but did'nt got any good results. Maybe it's a little thing for someone - for me it seems to be too big

I've made a filled stroke brush to change every black on a layer to blue. It is based on the original tint blue airbrush from one of the sketch panels. When I use some of my other filled stroke brushes with their opacity setting set to 30% and I come back to my tint blue brush, it keeps the opacity of 30% instead of 100%. So it looks like that the opacity settings are not saved in my blue filled stroke bruch.
Now I am searching for script (?) I can add to my blue brush to set its opacity to 100%. I tried with some georg commands but didn't catched the logic. I am an animator much more than a programmer

