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I had not thought to try using a bigger buffer capacitor in front of the Mayfly. I got some more stability with 1000uF with my ammeter in the circuit, but some configurations still got resets: I figured that it was confusing the voltage regulator somehow, as I could not resolve a deep voltage sag on the inputs when measuring. I will look at the datasheet again and meditate.
But if I could just set the brownout to 1.8V instead of 2.7V that would still be a nice test/check. I tried hooking up through the SD card vertical socket and the DTR pin of the FTDI connector, but wasn’t successful. I am wondering if the pin order in J7 is correct in the schematic, I can’t see the traces under the SD card slot on the PCB, so hoping that I can get clarity here, though I will probably just try to probe out the pins soon.