might be the waves you're on.
If your surfing lefts in a southerly and you take a line like you're surfing you'll head towards your kite and it will stall.
If you draw your turns right out and dump the speed (edge against the kite) by the time you turn back to the wave you've missed the section. This happens to me a lot on the goldie where the waves break pretty quickly down the line because the outer banks are often straight.
Im wondering whether the guys on videos are surfing more surfable reef breaks that are breaking on a better angle than we get on the south swell beach breaks on the east coast.
Thats my excuse anyway...