Whoa Mark! Only 2 chicks hatched from the eggs that were growing up to Day 17/18?
That's not good. There is a problem with temp/humidity in your hatcher (I'd guess humidity).
You opened the hatcher to add the newer eggs and lost humidity for the eggs that were in mid-hatch, maybe?
That's upsetting to me --- all the Frizz eggs I set here under broodies the same day, hatched well (early, but 100% hatch).
And yours were growing right up to the end, it just makes me sad.
Good luck with the rest.
Lisa