I have recommended Oxine to LM as well in a PM. Can't say enough about the stuff! Really does workMumsy sounds like you are getting a nice hatch, if drawn out. I was only thinking out loud about how you might increase hatch rate when it sounded as if you might only get a few, but things have progressed since then, yay!
Leah's Mom - if you have Oxine, you can make a spray with 1/8 tsp per quart of water and disinfect everything you touched and even mist your birds to help protect or support them. Chances are things are fine and you have nothing to worry about, just one of those things I do since I caused a Marek's outbreak in my flock by mixing hatchery-vaccinated chicks with those hatched here that are unvaccinated. Can you say guilt? I lost several Speckled Sussex and one Rhode Island Red. The vaccine the hatcheries use is a triple vaccine that includes live vaccine for chicken Marek's, unlike the one we can buy and administer ourselves which is only turkey Marek's. The same effect can be accomplished by running poults in the flock or by adding turkey manure/bedding to the coops and runs. Turkey Marek's causes a mild infection we don't even notice, which stimulates the immune system in chickens so that when they are exposed to chicken Marek's their immune systems recognize and fight it. The issue with live virus vaccine is that vaccinated birds shed the virus.
The University of New Hampshire published a paper that says if you have an adult (> 6 months of age) flock of chickens, they have been exposed and are immune, that Marek's is everywhere. Wild birds carry it, and it is transmitted via dander.
Chickens 6 months of age and older are generally immune.
One thing to know about Oxine - out of the bottle it is an antibacterial and fungicide; "activated" with citric acid, it becomes a virucide (sp?), but cannot be used while birds are present, and one must should a respirator when using it.
It kills germs on contact and quickly becomes harmless after that. Once mixed with water it is effective for 48 hours. I keep a spray bottle with me at all times when I am in the chicken areas now. I wash and spray all my food dishes every night, and have been adding Oxine to the drinking water at a rate of 1/8 tsp per gallon. I am about to taper down to every other day to get back to ACV in the water.

Keeps the incubator bacteria in check as well. I use it in the water in the incubator. I have hard water and it smells unless I use bottled water.. so I use oxine in our tap water instead. I also spray myself all over when I return from a chicken show. Rinse boots with water to get all dirt and debris off, spray with oxine. Set. Rinse again. Spray one more time and all is well.
I haven't actually activated it yet.