Most of the mod was done through IRC so you should have most of these changes
00:57:292 (8,1) - 8 should use SC: 58 and 59 on tail. 1 should use 26 (cuz I guess those are the long notes) or 60 if you feel a short note is better
00:57:892 (6,1) - 6 should use 55 and 56 on tail and 1 should use 25 for long note 57 for short note. Your preference.
00:58:492 (6,1) - 6 should use 54 56 on tail and 1 should use 24 for long note which makes sense here.
00:59:842 - 20 works here.
Changed to 54 for shorter sound.01:00:142 (4,5,6,7,8,9,10,11,12,13,1) - This part is tricky as fug cuz the scales go lower than the hitsounds you have and I don't think you wanna add MORE hitsounds :v. Technically you can improvise this. I made a meh improv by doing the following (going in order): 49, 51, 54, 56, 57, 56, 54, 51, 57, 54, 56, 54. I'll bring this up in the next point though because....
That next part at 01:01:342 (2,3,4,5,6,7,8,9,10,11) - Should technically be hitsounded since you wanted to emphasize 01:02:542 (1,2,3,4,5,6,7,8,9,10,11,12,1) - The problem is 01:01:642 - Should be A in the 2nd octave (as in A-22 in that piano thingy) which uh..you don't have.
For now I'll use the long sound 13, but I'm sure you wanted me to use the shorter sound so we'll come back to these improv areas. I could improv here too but uh...I'm still not sure what you wanna do. I still need to know what you want in terms of keysounds whether it's to follow the piano truly or decorate it with harmonies and improv in the less intense parts. If you're not sure then don't mess with this 00:59:842 (1,2,3,4,5,6,7,8,9,10,11,12,13,1) -
01:03:142 (9,10,11,12,1) - 9 is right but the rest should also be descending so (starting from 9) it should be 59, 57, 54, 52, 27.
01:04:942 (5,6,7,8,9) - SC:50, 49, 50, 51, 52.
01:05:692 (5) - 59
Changed to 25 for longer sound. 01:06:142 (5,6,7) - SC:50, 49, 50, 51, 52.
UUUUGH Man You should really add the lower notes. There's so much I can't hitsound because it's missing that lower A

Actually that's probably what took up the most of my time since I had to map around that missing note (as well as maybe the B right after basically what would be 48 and 47)
I'll stop here for now I really wanna get that sorted out because I'd rather not have to improv and follow the song personally and based on how most of the map is layered out it seems you do too so uh...Yeah don't kds this just find me in game and we'll try to get those missing hitsounds added somehow because they're pretty damn important. Also I'm out of time anyway :v
Fixed all of em save for the improv..