Am I the only one who notice that in his finish position his shoulders is forward of his knees? I would say that is why he is falling off at the end.. In order to keep balance your shoulders need to be over your knees...

I will be the first to admit that I have the same problem, but I compensate for it by not having my trail leg go so far left and keep it more behind me for balance (which I know is wrong), but until I can learn to not bend at the waist so much it is what I have to do.