that was some sick riding dude! Chase boats are not the easiest thing to do, i know. What we did that helped ALOT was made a makeshift steady cam. Basically all it is as a piece of 2ft pipe with a 3-5lb weight at the bottom of it, it attaches under the camera and works REALLY well. Somethin to look into for future filiming....
Hah did a quick search and this is EXACTLY what my buddy built. CHeap and effective!
http://steadycam.org/