I posted a thread regarding breeding stats/clutch results....
http://ball-pythons.net/forums/showt...esting-stuff-)
I think that you will find, the more eggs you produce, the more problems you will encounter. You can't save them all, but you can only try to do your best. Sounds like you are on top of things, and sometimes it just does not go perfect.
Last December we had a Pastel clutch that had issues on many fronts..... retained sperm from absorbing the prior year, and she held on to her eggs for 78 days after ovulating. Only 3/7 babies survived. All the babies appeared to be morphs from the retained sperm the prior season (Mojave x Pastel).... no Enchi morphs from her pairing last year. The ones that survived had slight tail kinks. They ate and behaved perfectly normal and were given away as pets with the problems expressed to the owners.
That particular 0.1 Pastel has put on ~400g since last December and is well over 2000g. She snuck up on us this year. Cleaning her tub a few weeks ago she was very fat looking. Palpating her revealed she has quite large follicles already. We just started to pair her this week to our Black Pastel 100% Het Pied. He will not see much duty this fall as we picked up another male for our Pied projects. Pewters will not hurt anyone, and maybe we'll see a ringer on one
Some females need a "red flag" on their tubs reminding us of any issues from prior breedings. Both of these females have a little red sticker on their tubs just as a reminder to watch for any issues. Keep track of any males you paired up that produced funky clutches as well. It wasn't the males (Mojave and Albino Enchi) in our case as they both produced perfect clutches with other females this season.