Actually had the exact same problem with this Rubicon I'm putting back together.
I did the same thing you did; found a couple of small, very thin shims in my "bolts, nuts, shims, misc engine stuff" bin and put them between the clamps, while putting a heavy coat of synthetic grease on the bushing. Turns now with practically no effort.
I did the same thing you did; found a couple of small, very thin shims in my "bolts, nuts, shims, misc engine stuff" bin and put them between the clamps, while putting a heavy coat of synthetic grease on the bushing. Turns now with practically no effort.