Great news! I'm finally getting the hang of riding this bike!
@GeePig totally called it! Tightening down the head set dampened the steering, so I was able to keep this bike relatively under control! I managed to ride this bike around the cul-de-sac and the next more than once here in the past 30 minutes. It's far from perfect, it takes preparation and a decent amount of space to turn this bike around, but against all odds, this bike is still rideable. There's still a lot of room for improvement, but I think I can push forward with this wild design.
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I did manage to scrape the pedals while I was learning how to steer, but I'm not too worried about that.
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