@brentwoodkris,
I have not personally tried a chuck roast yet (hopefully soon though).
But I am sure there are plenty of people here that will be able to give some great advice.
From what I have read on the board here, the chuck roasts can be finicky and the best test is to try to swirl a fork in the roast and if it twists like spaghetti it is ready to be pulled. As I said, I have never done one yet, so YMMV.
Thank you.
Chris