I don't know if this helps but I'm giving my first shot at incubation. I was given 9 fresh eggs from my fiances parents and an additional two dozen for eating that have been in the fridge for over ten days. I thought what the heck? And threw 7 of the fridge eggs in with my fresh eggs. 12 days into it and ALL the eggs are developing fast!
Will await news of your progress. Do you know how old the fridge eggs were before they went in the fridge.