i finally learned how to ride blind... what did it for me was not only putting weight on my toes, but setting my hips forward which is what actually makes the difference distributing my weight. instead of putting weight on my toes and bending my hips (or leaning over), i learned to look away from the boat, stand tall, and bring my hips FORWARD. kinda like hip thrusting. that is what corrected my posture. if you bend your hips or lean over your toes, the rope will want to pull you back around.
i think landing is a different story, i have yet to land a wake2wake backside 180. however, just riding blind.. push your hips forward and be sure to look away from the boat