I would say your best move would be to get a Bosu ball and a surf skate and practise stacking on the front foot and keeping your coffee cup arm (back arm) forward.
Portsmouth, United Kingdom
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15 Jan 06:36
It's really difficult to see anything (to start with I couldn't even tell which surfer was you!)
But, at a guess, judging by what I can see, I'd think that you're not on the front foot, your back arm seems to be going behind your back and probably your front arm is blocking your twist.
Try getting more on the front foot, lifting the front elbow and putting it in your back pocket which may help.