Ye but then we come to conflict :) Some people say JS just increase amount of shots created, and JR determine how big % he is shooting.
What you just said that JS has bigger impact on % :)
It's in the game manual. So those "some people" probably didn't read it and just came up with their own ideas based on observation and no real data.
Which is why you realize players with lower JR can be better shooters (although opponent defense and where he shoots from and type of shots can also be factors).