@Horton, okay I get it doesn't work for you, but it doesn't sound like you think what you are doing instead is working either. My body gets sore just watching that pass. (I am 62 though and used to muscle my way around back in the day, maybe that is why my shoulders, wrists, and fingers feel 82?).
Wherever your chest is pointed is where the ski is going to be driven, and at the finish of the turn you are driving it down abruptly and hence the pull into your midsection is needed to complete the turn, versus a more erect posture and bringing the left hip around to carve a turn, you are just stopping, muscling the handle, and then holding on. It still goes in the books as 6, but man that looks like a lot of work, and only gets harder when the person in the boat brings you closer.
I wouldn't rule out you trying to drop your right hip down on the buoy with a tight upper abdomen while bringing the left hip around, that could give you better body position right away other than having to fight to gain it back, which you are doing.