3 degrees positive caster from a stock type suspension is pretty hard to get, let alone from a lowered truck. Your numbers don't look bad and from what you describe I would suspect something more like a tire problem. Can you swap some wheels and tires from a known good driver?
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
| 
