Most of the diffs are missing hitsounds in places that they should mainly because they differ in rhythm from the top diff. I recommend making a hitsound diff of some kind or just going back through all the diffs and fixing them all because it is noticeable the lack of hitsounds in some places in other diffs.
The top diff's hitsounds sound great but then every other diff suffers in places they mapped different rhythms. I would provide more examples but since its in every diff I'll only provide one for each:
00:45:083 (3,4,5,6) - Normal
00:38:683 (2,3,4,5) - Hard
00:51:349 (1,2,3,4,5) - Insane
00:43:483 (4) - Another
00:45:083 (2,3,1,2,3,1,2,1,2,1,2) - Extra
https://www.nicovideo.jp/watch/sm34065291
this is the best metadata source that i could find. although rc suggests to keep metadata with the original source i suggest adding the title used here into tags
