Its not rocket science. The toe-in is wrong, caster barely in spec. Toe needs to be on the minimum 1/16". You can fix the toe-in in your driveway, then test drive. If you still have the problem, have the alignment shop put in a little more caster. The specs are for a manual steering truck with bias tires that probably would not see more than 50-60 miles per hour and mostly dirt roads. Now you need more caster with higher speeds and power steering.
