Have a look at the Stick Surfing drills.
Using what Clay calls a "pattern interruptor" to make you concentrate on what your hands and elbows are doing may be helpful.
Portsmouth, United Kingdom
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17 Oct 19:43
Your take off seems good, you glide in and look down the line, but it appears that your back foot is turned at more than 90 degrees from the nose which is causing the poo-man stance.
If you can get that fixed it should help you get front on so you can stack on the front foot with the coffee cup arm forward.