Sorry for the delays.
[General]
So... there's a stage 1, 3, 4, 6, and extra? Kind of odd, but okay.
Remove extra from tags. I know it's the extra stage, but it's kind of a broad tag.
[Stage 1]
Stage 1's third, fourth, and fifth uninherited offsets are 1 ms later than the other difficulties. Line them up, please.
00:12:304 (1) - I don't recommend stacking under sliders for the easiest difficulty.
00:16:349 (2) - ^
01:06:068 (1) - This is kind of an odd rhythm to throw out as a normal hit. Maybe turn 01:04:888 (1) - into a single hit, then do a slider from 01:05:562 - to 01:06:068 -
[Stage 2]
01:01:517 (1,2,3) - This part plays kind of weird since you switch to the piano part halfway through the slider, then go back right after. Maybe just have the first slider start at 01:01:686 - instead
01:42:977 (1,2,3,4,5) - This felt out of place compared to the rest of the map up until this point.
01:59:325 - This section is kind of iffy on spacing, but it seems to play okay... I dunno. :/
02:20:392 (1,2) - I liked these better stacked, but up to you.
02:29:830 (1) - End this at 02:31:853 -
02:34:381 (3) - Eeh, might be better starting at 02:34:549 - and ending at 02:35:224 -
[Stage 4]
00:50:731 (2) - I .. wasn't really expecting a beat here. Kinda hoping for more following of the piano. If you want, maybe move this to 00:50:731 (2) - ?
02:21:740 (1) - This kiai section felt kind of boring at times, then fun at others. Think you could up the intensity to the same level the entire time?
[Flight69's Stage 6]
02:10:111 (1) - During this section... I think it'd play much better as a semi-jumpy section without all of these added phantom beats that aren't even in the song at all.
[Tatsuo's Extra Stage]
Uh, I think you got the pace of the phrases down incorrect. Each phrase is taking two measures (8 beats [8 white ticks]) so it might be better to start the phrase with the sliders instead of ending and starting each phrase with one. Also, with your new combo usage, it reflects that maybe you hadn't noticed it. So:
00:10:113 (1) - Remove new combo
00:10:450 (2) - New combo
00:12:304 - New combo here if you change the sliders around to make more sense with the passage of each phrase.
00:14:327 - ^
etc.
Also this first section could use some sprucing up of hit sounds. Use the soft whistle more~
01:31:854 (1) - Same thing happening here as from the beginning.
03:02:021 - Add a note?
The maps are fine technically, but there's some good room for improvement. Good luck!