Sorry your still having trouble.
Curious to what caused you to need a new shifter originally..
"I was riding out of my apartment on a fairly cold SoCal day, about 37° out. No warm-up, just powered on and rode off. "
"it's been about 4500 miles since the last oil change, albeit I didn't change the filter"
Thick old cold oil and you just fire it and drop the hammer?
Caramba, do you not love your VROD?