Thanks for the replies I will try your tips just with my own eggs atm. I had the humidity down to 20-30% at the start but to my inexperienced eyes it looked like the air sacs were growing too quickly so I increased to 40%. We’ve just come off the end of winter so maybe now spring is here I won’t have so much fluctuation in temps...I also had the thermometer sitting next to the eggs during lock down so I’ll try have it level with the top of the eggs next time.

Post here with results! I would love to see you have a great hatch