Today is day 59 and I guess I should wait another 10-15 days.

The eggs are a bit softer than before, with slightly visible sagging of the shell. I don't want to do cutting since my incubation temperature is at the lower end of the spectrum like 85-89°F, and I believe the babies are not yet fully developed.

Do you experienced such prolonged incubation? I know BP eggs are hardy when it comes to temperature, as long as it is constant.
What is your idea about this?