Thanks for the idea. If I understand correctly, I am connecting the XDCS pin from the wing to 3V3 (through a 100K resistor). When I did that, the wing stopped working altogether. Did I miss something in your description? Are you suggesting instead that this more like a pull up resistor for a switch?
I'm no expert, but if I understand the suggestion correctly, this basically keeps the XDCS pin pulled high all the time...wouldn't that mean the device would never know it should listen for commands from the feather (since it is normally active low)?