Phill.. I agree on the wide stance thing.. It's a common mistake and can lead to a bad habit.
I think shoulder width with at max and work towards as narrow as you can.
That way when you do get a sudden chop you can go a little wider for a moment to regain control and then go back to narrow again.
Hey Phill.. Have you ever noticed how close Matt Lumley's feet are together when he's paddling out..

DJ