Additional observations from me:
Overnight cooldown, parked inside and cool, push button, no throttle = no start.
4 hour cooldown till lunch, bike parked outside on a warm sunny 70F+ day, push button, no throttle = start.
This tends to be how it works for me, and like I said, I have just got in the habit of blipping the throttle. If a PC3 tweak fixes things, I'm all for trying that.
Tomorrow may be rainy, but just to confirm I might try to go fire her up without the PC3 in the morning just to see what happens.