00:57:630 (5,6) - Would stack those, avoid spaced out 1/4 as this section is already very spaced and dense.
I think those 00:57:630 (5,6) - are definitely lower intensity compared to every other vocals in this section, being lower pitch and also not as strong as the rest of the instrumental like 00:58:085 (7,8) - or 01:03:994 (1,2,3,4) -
This is a very simple hard difficulty and those are one of the few times there is a random spaced out 1/4, which I still think might be too much for this difficulty.
01:24:903 (6) - Would either turn this into a 1/3 or 1/6 reverse, perhaps ending on 01:25:206 - so the 1/6 gap is too harsh.