Help with Hop Twist?

I am having a bit of a problem with the 180 hop twist. I always come about 10
degrees short even though I try to picture myself doing over 180 degrees. Can
anyone give me pointers.

I have also been thinking about learning to hand wheel walk. I have see it done
two ways, one with stomach or chest on seat, and another sitting on seat with
feet on rim and leaning forward. Pro’s and cons to which way I learn anyone? And
what is the best way to start?