im having the exact same problem. ive been told the same thing but it's not working for me. i guess i just have to wait longer. it's been bothering me all winter. ill be out on the water in the next 2-3 weeks for sure.
i would have to say, dont be afraid to get height. i think that is what is dragging me down. the roation is the easy part. ive been told as long as you edge all the way through the wake and try to get real high, you wont need to worry about making the full rotation. as you said, you are 3/4 of the way around already... forget trying to spin the rest of the way, just focus on getting more height.
i dont know if that helps lol. i cant do them yet, im no professional.