Had serious trouble with loose steering. Once steering was centered I had a deadzone of about 1/8 turn either direction before the steering made changes to the wheels. I had a special sector shaft brace that had a larger pitman arm nut over stock that attached to the sector shaft rod that than bolted to the passenger side frame rail. The pitman arm (32.33mm?) nut happened to be way to loose and once buttoned up, steering was pinpoint. 4" lift, messed with caster and trackbar. Since you tried all other options try Tightening up the pitman arm.