I'm with you greyeyes, I would prefer the half-n-half to 50/50. The half-n-half could have a little give in the numbers, or so it seems after a few glases of wine.
Seriously, that is the normal, given a large enough and equal hatches to note the difference. However there are some hens that will throw more males or more female chicks. So I try to watch which hens are throwing what. I mostly get males from my Turkens and EE's, which is fine with me. My Sicilian Buttercups are hatched at a larger number, so they are a half n half ratio.
I have 22 5 week olds in the brooder house and sad to say I still haven't counted to see what is what, at this point it doesn't really mater. I know I have 14 S BC though, so I assume I have around 7 of each. The rest, when they are 14 weeks old, I will choose 2 hens and 1 Roo to keep and cull the rest when they are 16 weeks old or so.
If you are going to hatch, you will have to keep them all or cull a few. Its that simple.
Chickenfarmer, soon it will get hot and the molt comes and no eggs. Around here that is for 3 weeks for each breed, that is why I like to keep at least 3 different breeds. You need some more hens, that one is a breeder of males.