The picture that was requested would really help. There are two kinds of lower control arm bolts for the slotted holes on the lower front mounts on the axle. One has the large thick washers mounted on the bolts with a hole off to one side so that it is an eccentric cam that will move the bolt back and forth in the slot by reacting against the horseshoes on the outside of the mount. Those when adjusted correctly will change the caster/pinion angle. They were prevalent on the early models, roughly 97-early 99. In about 99 or so, they changed the washer to a large thick flat washer with the hole in the center. You can spin that type endlessly without changing much because the hole is in the middle of the washer.I feel weird about this because nobody on this thread nor the alignment thread even asked about the caster cam adjustment. It seems like you are all secure with it, and I am the over protective parent.
Be aware that if you have the eccentric style, that the axle is solid and you can NOT adjust the caster on one side. You should have the axle level and leave one side loose while you adjust the other to prevent from putting the arms into opposite pre-load which can cause premature wear.