Righto.
So you fixed the offset/bpm, but the notes didn't snap to the right positions. I've taken a guess as to the positions you wanted them.
For now I'll just give some very generic pointers.
Also, don't kudosu this post. Modders are only supposed to receive kudosu once per map, and you've already given me some.

[General]
You need to go through all your difficulties and add some interesting hitsounds!
Try to keep the rhythm and new combos falling exactly on the start of every other bar. For a song like this you probably need to aim for 2 bars (8 beats) per combo.
You might want to change the combo colours too. To me, using the default ones tends to leave a map feeling... unfinished.
If you're going to put "arpeggio of blue steel" in the tags, change the source to be the Japanese title.
Aim for perfect distance snap everywhere unless you want to accentuate the eccentric flow of a certain part of the song.
If an average player can play your map and full combo it first shot, you know you have your spacing right.
[Easy]
00:19:351 (1) - 00:19:573 to 00:21:351.
00:22:017 (1) - Move to 00:22:240.
00:23:795 (2,3) - Move to 00:23:573 and 00:24:017.
00:49:795 - Add a note here.
01:02:684 (1) - Extend this to 01:03:573.
01:08:462 (1) - Shrink this to 01:09:351.
01:10:684 (2,3,4,5,6) - Bring these all back one beat to start on 01:10:240.
01:18:906 (1) - Change this to be 01:19:1278 to 01:20:906.
01:21:128 (2) - Move to 01:21:351.
01:22:017 (3) - Move to 01:21:795.
01:22:462 - Add a note here.
01:23:351 (1) - Change to 01:23:351 to 01:26:240. Keep the final spinner the same on all difficulties.
[Normal]
00:19:461 (1) - 00:19:573 to 00:20:906.
00:23:573 (5,1) - Try to avoid small slider overlaps like this unless it's intentional and makes the map more fun.
00:24:906 (1,2) - This is bad for a Normal difficulty.
00:27:129 (5,6) - Also bad for Normal. You could do it for a harder difficulty, but you would need to make sure the (6) is perfectly stacked on the end of the slider. At the moment it's slightly below it.
00:31:129 (5,1) - Bad overlap for Normal.
00:32:240 (1,2,3,4,5) - This half beat offset doesn't fit the rhythm of the song. Bring them all back half a beat to start at 00:32:017.
00:34:683 (5) - After moving it, shrink this to be one beat (end on 00:35:128).
00:35:573 - Add a note here.
00:56:906 (2,3) - Bad overlap for Normal.
01:07:129 (7,1) - ^
01:12:906 (3,5) - ^
01:20:906 (4,5,6) - Bad overlap for any difficulty. Also try to keep the rhythm of this section consistent.
01:23:573 (1) - Change to 01:23:351 to 01:26:240.
[Hard]
00:13:351 (6,1) - This doesn't play well.
00:19:351 (6,1) - Too many repeats, and the overlap with (1) is bad.
00:27:795 (9) - Starting a bar on the end of a slider doesn't always work, especially if it's a repeat slider. It fits some songs and styles, but not this one, I think.
00:34:795 (1) - Starting and/or ending spinner on a blue tick is bad (and probably unrankable). Bring it back 1/4 of a beat to 00:34:684.
00:36:017 (1,2,3,4) - This is ok, but you need to make sure the slider notes are perfectly stacked or it looks messy.
00:38:684 (5,6) - Slider is too close to (5). Bend it out a bit more.
00:46:017 (1) - Move this to 00:46:240 and make it shorter so it doesn't bounce off the blue tick, then add a note here at 00:46:017.
00:49:795 (1) - This combo is way too long!
00:52:240 (9) - New combo here.
00:52:240 (9,10) - Bad overlap.
00:57:795 (1,3) - Move (1) down a bit and (3) up a bit.
01:02:684 (4,5) - Don't overlap these.
01:05:795 (4,5) - ^
01:10:906 (4) - Too many repeats.
01:16:017 (3) - Get rid of one of the control points on this slider to make it a nicer curve.
01:22:906 (10) - Change from a slider to a note.
01:23:462 (1) - Change to 01:23:351 to 01:26:240.
[Insane]
00:13:351 (5,1) - Don't overlap these.
00:19:573 (7,8,9,10,11,12,13,14,15,16,17) - New combo, and make this a nicer curve.
00:24:017 (9) - Delete this.
00:24:128 (10) - Don't start a slider on a blue tick. Change it to be 00:24:017 to 00:24:462.
00:27:128 (5,6) - Too close together.
00:30:462 (4,5) - Don't overlap.
00:32:240 (1) - This looks bad. Just make it a nice 3-point arc instead.
00:34:795 (1) - Change to 00:34:684 to 00:35:573.
00:36:906 (5,6,7,8) - See my comments in [Hard] about stacking sliders like this.
00:49:573 (1) - Delete this note, and move the next one down and away from the previous slider 00:48:462 (8).
00:51:573 (1) - New combo.
00:58:240 (8,9,10,11) - The notes are too close together for this pattern.
01:02:684 (11) - New combo.
01:03:684 (20,22) - Delete these and move (21) and (23) somewhere else.
01:04:462 (2,3,4,5) - Again, these need to be stacked perfectly, and shouldn't overlap with 01:04:240 (1).
01:12:684 (5) - Move this so it's not in the middle of that square (1-4).
01:18:240 (7,8) - ^
01:21:795 (6,7,8,9,1) - Try to keep the rhythm of this the same in all difficulties.
01:22:684 (9) - Remove the repeats so this ends at 01:22:906.
01:23:684 (1) - Change to 01:23:351 to 01:26:240.
がんばって!