All experienced guys in SUP say the same thing: you need to ride a shorter paddle.
Dave Parmenter was saying that in a recent article.
The SUPer on this photo, Patrice, says the same : this paddle is his longest one ! When it is windy or hollow, he use a 2 inches shorter paddle.
So have a look at your paddle. If when you paddle your hand on the handle is over your shoudler : you are wrong !
SUPer : Patrice Guénolé on a GONG board.

Source : Team GONG SUP, summer stand up paddlesurfers 😉