Ditto to Bill's comments. The caster difference is actually beneficial, as it helps the truck run straight down a road with some drainage crown. Adjusting the caster approximately 1/2 degree more negative on the driver's side makes the front end lead slightly left, which helps it "climb" a drainage slope. Since almost all roads are sloped a little toward the shoulder for rain drainage, a little left lead is a good thing. You could increase the shim thickness a little for better return to center if you choose, but it will also increase turning effort.
There's very little to be done about the thrust angle without changing spring bushings, shackles, etc. The numbers don't look bad at all. Be sure the alignment shop knows how to adjust the "center point' of the steering gear. A lot of younger techs who deal mostly with rack and pinion steering have no idea how to adjust a worm and sector steering gear, and it's an important first step before moving along to other adjustments.
Jerry
