Some genuine consistency issues, like what sounds to what notes/rhythms around the area (under the premise of no special structuring used like abekobe and don/kat gradual changes)
Spread is not even. Take Inner into consideration here is appropriate, so Muzu-Oni-Inner has note counts 747-1069-1199 which means Oni can definitely be nerfed. Taking look inside Oni reveals the same.
00:19:402 (35,36,37) - 00:23:726 (45,46,47) - 00:26:537 (61,62,63) - 00:29:322 (77,78,79) - Consider normalizing their SV with smoothly increasing values for all diffs. This can improve the visual of the maps if the notes are sitting between bpm increases