/ic/ - Artwork/Critique

I'm following https://www.ctrlpaint.com/digital-painting-101/blending-paint but I'm having issues mixing colours. In the video, he mixes with a brush @ 50% flow, eventually changing to 15% for a more subtle mixing.

Now I'm using the same brush presets and I can't mix not at 50% nor at 15%; the only way I can do it is if I lower it to the minimum of 1%. What am I missing? I'm not pressing too hard on the tablet, and I'm sure tablet pressure is ok since the wacom settings report as much.

huh