I'm not the OP, but just tossing in my followup post. I got an alignment today and asked about the caster. Here are my before/after numbers, as you can see I was ok on caster already. Just a little tweak to the tow in, and they swapped the front tires left-right. The pull is gone, so I'm happy.

The tech did say he'd be happy to add in more caster if I wanted, but it would require a different bushing. So at least it seems like he knew what he was doing? Since I'm already almost at 5 degrees and it drives fine, I'm not messing.