Your detailed explanations are so helpful, I'm truly grateful.
I think the biggest thing I was missing (aside from the sensor size being off) was not taking multiple passes at the auto track. I was unaware that was even an option from the tutorials I had been following, but it makes a ton of sense. I think going through and deleting tracks is the next piece that I need to get better at understanding.
I appreciate all of the help you've given me throughout this project and will post the final result in this thread once it is client approved and live. For now, the first review went great!