My first thought was reaching out to former professors by email (can't visit in person), but I wanted to see if there was a more appropriate way, like an online pre-print vetting community or something.
I will definitely tone-down my description of the current state of drag prediction; definitely don't want to offend or be considered a crackpot before anyone even looking at my derivation and results.
But it's not really a good place to attract attention. Dozens of papers are published there every day, and the more unconventional ones tend to get ignored (unless they're authored by people who are already famous).
Another thing you might do is attend a scientific conference. If possible, see if there's some small, not-terribly-prestigious conference in a related subject, somewhere within driving distance. In my subject, number theory, these are quite common; they're typically held over weekends and are largely designed to give graduate students a venue in which to speak.
Book a hotel, go to all the talks, ask questions. If you strike up conversations with people, you might can ask if you can run your theory by them.
I would love to go to conferences, though it might be expensive for the ultimate aim of getting professional second opinions. Will look into it!