I gave up. Julie wins, and is back to a singlespeed. More filing the cog and messing with the chain yielded no results, and brought me up against my prolegomena to any future cycling: I am a poor mechanic with a limited tolerance for tinkering. A character flaw, yes, but so be it.
I’m going to kick around a 34:20 for a while, see how tall it feels out on the hills. A vague plan is to push in through some intensity work for the next month and see if I can push it through the Rim Ride and KTR. I want to concentrate on physical adaptation and not succumb to the singlespeed disease of gearing obsession. I should note here that not once during SSAZ was I asked what gear I was running.
So now I’ll be putting together the fixie as a town/pave/fire road bike. For a rear hub I’m looking at this:

Echo fixed cassette hub. Fits six nine-speed cogs, with no freewheel. Given my surplus of ss cogs and spacers, it would be cheaper than a Surly hub, track cog, and lockring. A trials hub seems like it would have no durability issues, either.
So, now that this is all done, I’m looking forward to heading out in the next three days and putting some nicks in that nice new Blackspire ring god.
Just registered for the Wahsatch Steeplechase in June, the weekend after the Kaibab and should be an excellent course for me, steep and technical up and down.
If anyone wants a 25t Endless cog that’s a bit modified but still I imagine perfectly useable, let me know.
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