the hard starting after a quick stop & go is common. mine has done it several times, but not often enough to be a problem. like half a dozen times over 2 + years.
i did notice though that if i stop & leave the key turned on, then try to start it again it will stall out almost immediately unless you keep the rpms high. it does it almost every morning before work if i let it. i'll pull in my buddy's drive, hit the kill switch while he's getting his bike going, then try to start it again & it stalls right after starting. all it takes is to turn the key off, wait a few seconds, then on again & it starts & idles fine. i figured it was something between the EFI & EXUP settings & it resets when the key is turned off then on again. not a problem anymore since i use the key instead of the kill switch.