In Kiai parts, I recommend you to use more 1/4 beats. These parts are the highlight of the song but your beats are too simple. It makes player feel the Kiai parts, which should be the most exciting part of the song, boring.
You already introduced some 1/4 beats like 00:07:447 (1,2) - , 00:22:278 (3,4) - 00:46:885 (2) - and many others. Therefore, you may allowed to put more 1/4 in Kiai parts. Even if you want to follow only the main piano melody, you can still catch some strong sounds on blue ticks like 00:52:699 - , 00:56:744 - , 00:59:104 - and many others.
antiemphasis works nicely, i think it feels cleaner and i think it would diminish the contrast of this section if i use too much 1/4 01:35:761 (1)
01:35:761 - It is a nice idea to use 3-time reverse sliders to express the synth sounds like 01:35:761 (1) - this. However, this kind of sliders are used only in this part and it is visually confused with 1 or 2 time reverse sliders.
Therefore, I want to suggest you to use only 3-time reverse sliders in this part to make it not only visually clear but also emphasizing the synth. Of course it's up to you but I'm gonna show some beat suggestions as examples. https://osu.ppy.sh/ss/19415429/0638 | https://osu.ppy.sh/ss/19415430/955c
#4700779
00:07:447 (1) - and 00:10:144 (2) - here, 00:08:121 (3) - and 00:10:818 (1) - here, 00:56:660 (6) - and 01:07:447 (1) - here, and so on.