try to rotate faster it looks close but like your arm colapses halfway trhough and you get stuck try a little faster and rotate a little faster. and nice stomach slide down
You are doing everything ok, but set your rotation a bit harder. think of doing an ally-oop flair (you more or less are now, but giving up halfway) and rotating around your hand that is planted.
It was tough to find a good spot on a natural quarter. When I did have more speed though i ended up basically looping right out on to the deck... it was pretty funny. But annoying at the same time.