Two things are left, the power steering box and rag joint. You should have started with the steering shaft/rag joint because I can promise you all your slop is coming from that.
Depends on your budget but you have three options for the steering shaft issue. First is replace the rag joint, probably be better but not great. 2nd is the jeep grand cherokee steering shaft mod, it replaces the gn steering shaft with the jeeps, much much better. 3rd is to go with the detroit speed steering arm, its like the jeep arm but a nice billet piece (I have this)
The steering box you have will probably be fine with the upgraded shaft. The GN had a quick ratio one so unless there is an issue your probably ok. If its not you can upgrade to a more modern steering box the 600 (they basically bolt right in except for one hole), a lee rebuilt box or go all out to a rack and pinion.
I went with the lee 600 box from DSE and their steering shaft. You need to tell them in advance if your ordering it because they have to spline the shaft differently. I have no idea how the cherokee shaft and the 600 box would work. In my opinion just get the jeep cherokee shaft and go from there