Instead of tightening the nut to 100ft-lbs, tighten it to like 15 or 20. It'll make getting it loose each time much, much easier (once you get it to where you want it, then tighten it to the full torque).
With those numbers shown on the sheet you got from the shop, I would say a few washers under your coil spring seats are in order here (would put your numbers with a 0° bushing much closer to where you want them).
Also, are you using the roll plate (or some other means to eliminate binding between your front tires) like is suggested you use on the
steering tech page that was posted earlier? If not, then that may explain why you're getting so much apparent positive camber.