Just wanted to take a moment and say thank you for sharing this information gentlemen.
I need to work on my suspension once I get my auto swap done.
Just to summarize my opinions on this:
Your best bang for buck on these trucks is to take care of the track bar in one way or another.
That BD lower bearing for your steering gear box was a marginal increase in performance for me.
Adjustable control arms to fix caster was a marginal improvement for me.
Having tight ball joints, drag link, and tie rods played a big role.
Setting Toe-in correctly is always important.
Stiffer springs helped with control at higher speeds and corners, but definitely hurt ride quality a lot.
Make sure your sway bar is hooked up, and the end links aren't all worn out (that helps cornering and helps fight death wobble a little).
Balance your damn tires!
I have cheap shocks (can't justify QA1's), but having ones that actually work and aren't empty cylinders makes a big difference.
In a bind, while towing and having death wobble on the road, I lowered my front tire psi about 10psi and it went away. Replaced the track bar heim when I got home, aired back up, and it was fixed.
I've also fixed it when I was broke and in college by putting a shock in between the track bar and drag link. It worked surprisingly well.
These are both bandaids though. Obviously.
Good luck guys!