It looks really nice. Timing is off though. Hmmm... try:
BMP - 83.66
Offset - 78
Also, at 1:26:68, the slider needs to be 1/8 beat smaller.
And having multiple Timing sections can be a real pain. Watch out for that. And try testing out at .25x speed. That may help.
I think it's fine besides that...
And congrats on your first beatmap!
EDIT: Okay... now try:
BPM - 83.53
Offset - 80
I think that's it......