Help with front end alignment

You need to find an Old School Tech
Thought I had found one but even he screwed up by setting my toe in to 1"!! At the time I had been learning about front end geometry and what caster and camber did for the car so I started to learn how to do it myself then take the car to have it checked. I dialed in the camber where I wanted it and just guessed on the caster (eyeballed it?? lol), set the toe and did a test drive and it felt good and actually went straight so off to the shop we went. The 'old' guy said things looked good except the toe was off a bit so he set it. The dang thing felt like it wanted to roll over on the way home. I set it back to where it was before going and never looked back. And how does one make a mistake like that on an alignment rack??