Boy do I feel stupid, I thought you were asking what to look and it's pretty obvious from your blog, that you know exactly what you are doing.  Sorry about that.  I haven't been on here in a bit and thought you might be someone new looking for help and you aren't.  But while i have your attention maybe you can help me.  I have noticed some of mine look like they have just about developed, but then stop.  This might sound gross, but the chick is just about fully formed but the belly hasn't completely finished developing.  Do you have any ideas on what might be causing this?  If I'm not turning them enough or something ?  You're experience, after making a fool of myself, would be greatly appreciated.  Most of mine have hatched nicely but my last batch looked so promising and then didn't hatch.  I'm too curious so I have to see what went wrong.  
Thanks for any help,
Margaret