I added in XJ leafs to fix my -2" sag. Got it only about 1" over stock, ditching all of mine but the main which I left in.
Personally, I found it a waste of money. Better for the Dakota leaf packs. Cut the eyes off, ditch the overload leaf, bolt up onto the main leaf that was left in, and use your bottome XJ leaf and you're good to go. Should get 3"+ of lift. With my searching best to get from a 91 or earlier. As well being 'broken in' they don't lose much of the lift when they settle in I've found. Ride is great too. Not harsh at all.
Good luck!