Sorry your last owlbeard quit, that sucks

It didn't sound like you did anything wrong in particular to me at least, and the seller seems ok? Shipping can be tough on eggs. I would try again after your trip, june seems a bit unlucky but maybe you're meant to have owlbeards in July?
I had another power outage this evening for 30min, incubator temp droped to 90F - I guess that's no worse than a broody duck taking a break, so maybe it's ok?
My duck hen is still broody so far, i do find her on the roost in the morning but she spends most day on the nest and is there in the evening when i put birds to bed so she might just go roost in the morning while chicken take over to add their eggs in her fake clutch.