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grgd said..
What am I missing?
I guess, like 99% or surfers, you are just missing ... speed.
Speed is the mandatory ingredient for turning.
There are two ways to generate speed:
- pump the board, but it wont work with a 10' board
- "tap the juice" by using the wave power zones. I would guess that you are too low on the wave, where there is not enough power for your board to get speed.
As described in
www.surfertoday.com/surfing/the-energy-zones-of-a-wave , aim for the pocket/curl, and avoid the flats and the shoulder.
On the flats, bad:

In the curl, good: Look how the riders are constantly getting into the upper zones of the wave to accelerate, so they gather speed to then "spend" in turns.