See, your's sped up and mine have slowed down. I have a sebright unzipping now, first chick in a while to start hatching out. I'm amazed at the number of large fowl I hatched on Day 19. Had all those eggs on the outside edges of the incubator. Bet it's a little warmer out there.
I'm up to seven and one zipping now. I know my edges are warmer. I have thermometers everywhere. It's a standing joke with me and my wife but I'm learning how the air moves in my bator just by watching the different temp changes.