The stock steering wheel “crush can”, bottom of column slip joint, and the pitman all have master splines.

Not sure what aftermarket coupler you are running. Not sure if they have a master spline.

There’s nothing you did that should change Ackerman if you are running the stock length pitman and idler. Are you getting that measurement from your turn plates by reading the difference Left to Right of you front wheels by turning one wheel a spec amount. Does the repair manual give a spec for that?

So is there not enough adjustment in the tie rod sleeves to get the steering wheel to centered?