Custom rgb Effect

[silk fiber]

Can please someone explain to me what I'm doing wrong in my code?
I want to set a color to 30% brightness and then add the solid splash effect on top, but only with a change in brightness.
What I'm getting, please see for yourself
Thanks in advance.
Keyboard: keychron V6
Link to my rgb_matrix_user.inc: https://github.com/ActuallyaCat42/MyV6/blob/main/v6/iso_encoder/keymaps/wave/rgb_matrix_user.inc

[cedar tree]

Disco keyboard

[pseudo birch]

Solid splash code is here https://github.com/qmk/qmk_firmware/blob/master/quantum/rgb_matrix/animations/solid_splash_anim.h and doesn't look much like what you have. You may be able to just make a copy of that and modify it slightly