Looks good and excellent write-up
Unfortunately these trucks will still behave in accordance to the laws of physics so comparing a highly modified truck to a sports coupe weighing 3000lbs less will leave anyone with a sour taste in their mouth. I would highly recommend installing a larger set of sway bars (I prefer the eibach 35mm front and 32mm rear) as well as shorter end links for the rear sway bar.
As far as the bumpsteer is concerned installing some heim'd tie rods and a steering stabilizer are the best methods for reducing the steering issue but remember, these trucks are quite nose-heavy and the torsion bar front suspension isn't designed for excellent handling characteristics.
I would also suggest installing some airlift helper bags as they will drastically increase the ride quality as well as towing capability. Z71 Tahoe front bumpstops (gm part # 15153959) are also an excellent addition to improve ride quality. These torsion bar ifs trucks have no natural rebound like a well-designed coil spring suspension or even leaves so an excellent dampener in conjunction with a stiffer jounce stop will make the suspension much more responsive (though you are limiting the amount of travel from the front suspension).
There is a bit of trial and error involved in setting up the suspensions on these trucks, but they ride and handle quite well once you spend the time doing it correctly. Best of luck to you and we're all here to answer an questions you may have.