Damnit I was mapping this too lol.
Anyways, just a few quick things I noticed:
insane:00:21:502 (4) - This slider feels terribly off, due to the fact that the fading vocals are very hard to hear, I honestly had to listen to it at least 5 times before I realized this was actually mapped to something. Starting it 1/2 earlier would be a lot better already. Alternatively, you could do something like this:
http://puu.sh/5gdw7.jpg01:29:088 (1) - Would fit better if this slider started 1/2 later and a note should be added where the slider originally started, don't forget to add a finish to the head of the slider.
Hard:00:15:985 (3) - This slider doesn't feel right either, I suggest starting it 1/2 earlier, stack it with 00:14:605 (1) - and rotating it a bit so the sliders don't overlap. You might also want to consider adding a note at 00:16:674 - if you fixed it.
00:21:329 (3) - Same as before, 1/2 earlier, and adding a note at 00:22:019 - would be necessary here, maybe also at 00:22:709 - to prevent confusion
01:05:985 (4,6) - Might be a bit too hard to read
That's all