from what i have read the bubble wrap should actually help to a degree, it helps them to not lose moisture in transit, making for smaller ACs for the start of incubationI can't help but wonder about the bubble wrap. Eggs are porous, is it possible the wrap could interfere with air and moisture exchange? I've hatched them,but I always wonder....
and there have been studies that lower oxygen levels for the first week of incubation and upping it for the last 2 can help make more robust chicks
BUT i have NOT actually tried any of this, just read a few articles