Got the knuckles back on, axle back in, and tacked them in place at what I hope is +8. The hope part being that it is really difficult get an exact dip with an angle finder due to the lack of straight lines to align the tool with. Rotate one side of the finder towards or away from the leaf springs a fraction of inch, and you can easily get 0.5 degree difference in your reading. I tried several techniques, with the kingpin, without, with a square, etc. They all seemed to have one flaw or another, ended up just using the finder on top of the knuckle, aligning a corner with a "straight" spot, and eyeballing several times how orthogonal it was to the axle tube.
The frac crew I use have a couple of professional welders on staff. I am going to drop the axle by there when I got to the field next week. I don't feel like risking 80 MPH down the highway on my welding. Especially b/c the knuckle I heated can easily be turned by hand. It was a beating to set b/c how easily you could rotate past the desired caster angle. The untouched knuckle took quite a bit of flap disc to get a snug but manageable fit.
I'll start on de-clocking the Tcase and modifying the crossmember next.