I run a PST 20:1 and that same slop is there. I can yaw the wheel back and forth a bit with no response out of the steering. I was hoping the new box would eliminate that issue, but it didn't, same as it was with the stock 24:1 box.
There should be no slop in the new steering boxes that we supply and if you have that would be the first I have seen. Is all the rest of your steering linkage new? I only as is that you mentioned you had it prior to replacement of your order boxes. Was the play the same amount? Our boxes are adjusted upon assembly but that is not say that the one you received maybe slightly loose. Have you made an attempt to adjust it? Did it make a difference? If not adjustments are made the same way as outlined in your vehicles factory service manual.