Replying to Free run edit, looking for a critique!

Flip Day from Dylan McCullough on Vimeo.

First Edit, ready to be thrashed by you exerts! I realize i got carried away with the slow mo, a issue for me was video quality, looked good in FCP, a little worse once exported and then like total shit once on vimeo, shot with a T2i in 60fps, kit lense, converted all the footage to 30fps. Any tips on proper work flow? any feedback is appreciated thanks