Congrats on your Queenbee!
Now I cut my eggs at day 53-54, but I admit I am a bit more careful when it comes to cutting. I see you rip the egg apart and A LOT of fluids run out. I'd advice you to be a little bit more gentle with the eggs and the fluids contained in them, because if a hatchling is left without most of its fluid and still a yolksac, things dry out very easily. No offensive behaviour - just an advice from breeder to breeder
Greets,
Yaron