i think the kiai structure is alright but theres some things i'd do to emphasize the improv a bit more
i.e. adding a note in places like 01:02:691 / 01:09:749, you could honestly even make 01:09:970 a triplet for some progression from muzu
01:13:279 - you could add a note here and change 01:13:941 to a kat, this break works for muzu but it kinda breaks the flow on the oni
01:16:808 - maybe make this another pattern (like dkd) so you don't play kkd twice?
01:18:573 - triplet here would add a nice flow and separate it from muzu a bit more (i would probably make it something other than a ddk though)
01:20:338 - i would remove this to split the pattern because this one in specific is relatively longer compared to the others
01:23:646 - triple here and a note at 01:24:308 for consistency on the structure suggested at 01:09:529 -
same for the other kiais where it applies