Well, I don't know if I changed too much, but I removed the "Previous System1" folder from the "Previous System" folder and then reran SD! (about 8 hours later than the original run), and then SD! completed normally (the only thing that didn't carry over was an app in my dock turned into a question mark, which was easily taken care of).
This may be coincidence, since the time frame changed AND I changed the source material, but it is what it is, and it seemed to solve the problem.
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