My caster mod (with pictures)

[BMERDOC]

It would seem that this has turned into a lot of research but I think the answers will be worth it. Any guy on a budget will be able to modify the stock stuff and make vast improvements on how his/her truck performs.
FWIW, my progress is slow but I work and research (watching everyone here) to figure this out. 1/4" of movement for 1° of caster is fuzzy numbers at this point but lets step that up one notch. If 1/4" is worth 1° on the bottom why not machine the uppers 1/8th" to have the extra .5" movement to equalize caster on both sides? Again, all research and little to no development at this point but I'm thinking. You would only end up shimming to equalize camber at that point. Then again you could machine the uppers down to equalize camber. Certainly, there is a time when all that machine work adds up and it may be worth it to pay the money for tubulars but then you are still at the mercy of the guy manning the alignment rack.