Got the van back from the shop last Friday and drove it a little over the weekend without an alignment, and things seemed much better already. They ended up modifying the install a little, since my arms were flipped upside down (which does get the caster closer).
Got some time on the alignment rack with my tire shop yesterday, and only drove it home a short distance. The real road test will be today.
Here's a picture post alignment with 2.8 degrees of caster. Plenty more to go on those cams, but those folks though that that was about what I would like (they do know me):
I almost certainly still need shocks. I had barely started that conversation with Ramsey (RIP). Will call Agile after some of my own work insanity dies down.