Did my best to tweak with milk drop the best I could.
I had Milkdrop 2.0 running faster under Winamp , For some reason Music Bee caps the FPS at 40 , *(I do not understand why)
I got it looking prettier, and it is at least 10 FPS faster.
the F5 key still does not work in full screen , Press F5 in windowed mode and it will persist to Full Screen.
Enjoy.
Instructions.
I used 7Zip to compress my whole plugins folder.
So it has Milkdrop 2.0 as well as the extra plugins folder and milkdrop2.ini file setup.
Just load this in alongside your plugins folder in Music Bee and Skip existing files
*edit*
https://drive.google.com/open?id=10VrzPYZtWSh-DaAEMkG9AtqBL9tYFEQQPlease post if its not working and i'll upload it again