There has been heaps of chat on correct entry and exit of your paddle to stop your board from yawing . Incorrect technique not only is inefficient but pulls your board from side to side. This is one of the best examples of how to do it. So clean and straight down the rail , if you place your catch out wide then pull in towards the rail it will turn you same as pulling the paddle away from the rail on the exit.
I found this on the Sup Racer web site.
www.supracer.com/with-apologies/