Depends. I am a bit over 2" lift and run 2" stop in frt and 2" in back, although I could get by with 1.75" in rear. Figured was more of a pita to cut them for 1/4". I have no issue clearing the tires, I needed the extension to prevent the shocks from bottoming out.
Did you get too long of shock? Splain to me Lucy! When I ran 31's, I didn't need any bumpstop in the front and 1" bumps in the rear.