I can understand your irritation with the potential slowness of the Grading Board, but forcing people to Grade is not really a good option (if that's what you're suggesting). The only way you can force someone to do something is to threaten them with a punishment, and the only viable one I can think of is to say that if you don't grade your allotment, your Grader license gets revoked.
I gotta say, I'd fight that lol. I spent a lot of time and effort becoming a Grader, and even though I Grade maybe one story every three months these days I still like the option. It's always better to try and improve the rewards of doing a job as opposed to putting on a requirement.
Here's an idea, do what I did. Become a Grader, and then grade-swap xD