A follow-up. Note, I still have not had a pro align the car, but several subsequent checks of camber front/rear have convinced me that my tools or technique are not up to the task. My measurements vary each time I take them. A professional alignment is in order when I can manage the time.
In the meantime, due to a badly scraped up front right wheel - causing more uncertaintly in my measurements - I swapped the wheels front/back. This lightened up the steering a lot, centered the steering wheel, and almost completely eliminated crown-steer. There is no vibration/oscillation at any speed or road surface I have encountered. This despite the fact I could discern no obvious uneven wear pattern on any of the tires.