Have you experimented with notes not conventionally used in Western music? Such as quarter steps and other notes that could be produced on an instrument such as a viola or a trombone that some would call "Out of tune"?
it is important to remember that 'quarter tones' are not used in eastern music either. the idea was proposed in europe as a mental experiment, and in my opinion does not have any basis in musical reality. using all pitches freely is very legit, and it happens all the time in speaking, or sounds in nature, everywhere. but the idea of dividing it evenly into 24 is not useful, in my opinion