I used washers on the front and middle bolts. It worked just fine. Daughter was very happy. And yes, it did raise the front leg part of the seat AND tilted the back some. I only went 3/4" on the front due to the length of factory bolts. I think it was 5/8" on the middle. Previous post is correct about the bolts being a pain coming out. Hint: if you take the front ones out first, you can lift the seat up for easier access to middle ones.
But an air ratchet would be a plus! Not sure why Jeep didn't correct this...it was very uncomfortable.