First things first.... thank you for avoiding using a fish eye. If there is anything that I am so sick of seeing in BMX and skateboarding videos is the use of a fisheye lens.
There were a few times where I saw some glitching, though I am going to attribute that to the stabilizing you talked about.
I think the video was probably overexposed by a stop or two. That smooth concrete can be an issue, especially in the sunlight. May have been able to get a little more of the color to pop though.
Nice focusing, it can be tough at times to keep under control.