I don't think there was any difference, during the night I set the auto-feeder to give her a snack at +6 and +8 too.
It's true I didn't set the feeder to turn to an empty slot at +9 in case she doesn't eat her +8 at +8, but it's very unlikely she doesn't eat it right away as she usually runs to the feeder in turbo mode as soon as she hears it turning