My suggestions:
Normal
00:40:507 (1,2,3) - Remove the long whistles on the sliders and just keep the ones at each start and end? They're somewhat jarring here since the music doesn't suddenly get significantly more epic or louder to match the sudden spike in whistles.
02:30:944 (2) through 02:38:410 (3) - Same as above.
Rolled's Hard
00:30:362 (5) ~ 00:43:267 (2) - Another section where I think it sounds better with two short whistles in place of each long one, though here it's more because the start and end of those sliders happen to match up with the high notes.
01:14:238 (2) ~ 01:19:776 (4) - Ditto.
02:15:152 (6) ~ 02:22:589 (4) - Ditto.
Expert (Too hard for me to play, but I'll try anyways.)
00:37:161 (2) - This circle feels out of place. Remove it?
00:39:005 (2) - Ditto.
02:27:230 (2) ~ 02:34:679 (2) - Try removing only the ending whistle on these sliders. I think it matches up better with the guitar riffs that way.
02:31:877 (4) - This whistle sounds out of place, probably because it breaks pattern by being a beat later than its predecessors.
03:23:465 (6) - Missing whistle?