Since I love this mapset so much I decided to take a look on the 4* diff, sorry if I'm being annoying -Thank you very much! Don't worry about pointing too much stuff out, the more the better as it helps moving the set forward.
The slider at 01:27:761 doesn't follow the song, why don't you make it a kickslider (or continue the burst/stream) instead? It would make more sense, specially because you focus on the guitar a little bit later; to be fair the guitar is a bit weird here, but I changed this part a bit to better follow the guitar
Other question: why on 02:46:382 and 02:46:589 you didn't make doubles and you did a little bit after when the drums are exactly the same? Just curious! not sure what you mean by "a bit after", if it's about 02:46:796 (3,4,5,6) - it's because i'm following the guitar, I could have followed the drums instead and mapped the 1/6 notes like you pointed out but that would have increased the density so much this part would have become indistinguishable from the next one which is more tense
Last thing I promise: you could even buff the last kiai a little bit - 02:48:037 to match the higher intensity the song is showing and the spacing is a little bit off on 02:49:279. I think the higher density makes up for it, i don't want to go too crazy with the spacing because the bpm is quite high, but i did change this part a bit
Good luck on getting it ranked, you'll see I'm a big supporter of this mapset. Cheers!