Not really grading related, more course design.
Just an idea!
But one action that would create a reaction without a lot of change to the system would be to incorporate lanes with a mixture of disciplines and also sitting shots.
E.g. lanes consisting of:-
1 x kneeler + 1 x stander
1 x sitter + 1 x stander
You get the idea.
This would also test the shooter on the lane clock Time and the ability to compose really quickly on the lane in between the changing position of the next shot.
EV2 - March X 8x80
EV2 'Rev' off Awesime, (the one he didn't spray black.) - Big Nikko