[Normal]
02:28:48 (4,5) - Too close together.
02:40:48 (3,4) - Double check the spacing here. It looks tight in the spacing.
[Metroid Mix]
00:43:02 (9,10) - Too close together (Maybe a slight push upwards with (10) can even out the spacing).
01:18:79 (8,9) - Too close together.
01:23:63 (3,4,5) - ^ (Could move down (4) a bit to even out the spacing.)
01:26:17 (1,2) - Too far apart.
02:24:79 (4,5) - Too close together (A small push to the right can fix this).
[Hard]
00:23:63 (1,2) - Push (2) up slightly (with grid snap on).
00:24:56 (2,3,4) - (3) and (4) has a larger spacing gap than (2) and (3).
01:08:63 (1,2,3,4,5) - Odd spacing fluctuation here. The spacing between (1) and (4) is smaller than (4) and (5).
01:36:33 (7,8,9,10,1) - Another odd spacing fluctuation here. Look at (10) and (1) then look at the stack at (7) and (10). (10) and (1) has a larger spacing gap.
01:45:79 (2,3,4) - Spacing fluctuation here too. (3) and (4) has a larger spacing gap than (2) and (3).
01:46:94 (5,6,7) - ^ ( (6) and (7) has a larger spacing gap than (5) and (6).)
02:07:94 (2,3,4) - (3) and (4) has a larger spacing gap than (2) and (3) here as well.
02:11:40 (5,6,7,1) - Spacing fluctuation here too. (5,6) and (7,1) has a larger spacing gap than (6) and (7).
02:13:48 (8,9,1) - Spacing fluctuation here too. (9) and (1) has a larger spacing gap than (8) and (9).
One more note, that black combocolor might be too dark... And for the spacing, there are still some left over issues from before. Did you try out holding alt and shift to adjust the distane snap at smaller levels? It could help with preventing the "hiccups" in the spacing which should also be double checked in the difficulties again (besides the taiko difficulty). Once that is fixed and that you've added in anything that is needed, let me know and i'll check into bubbling.
Edit: Issues addressed and fixed. Bubbled.