Why is it when I make a kick in serum that it sounds best on the note G# sometimes A# and not on flat notes (for harder styles)

I can't understand the logic behind this?

 

how are you defining "best"here exactly. need to provide a bit more context

 

Your listening environment flatters those frequencies most likely, but you can always try Ab and Bb for flat notes.

Or maybe you're just writing tunes where those notes fit so there's no need to tune the kicks further.

 

Your room has an anti-node at that fundamental?