I need a little help on tweaking my end of the incubation process. I've did a batch of coturnix quail and bobwhite quail (all shipped) and ended up with almost the exact same results. After weeding out non fertile and disrupted air sac eggs I can usual get the rest the eggs to develop far as having shipped egg development rates go. That's where the dilemma starts. On both hatches of quail species I get a lot of fully developed chicks but have a mixture of internal pipping or no pipping at all then dying. A couple had an internal and external pip, but it's mainly the other. After this same scenario played out again with another batch of quail different species different breeders etc etc I figured it must be something on my end that needs tweaking? I run my humidity 35-50% until lockdown then it's 60-75% have several different hygrometers that have all been calibrated so i know I'm pretty accurate there. According to my brinsea spot check thermometer I'm running my Genesis 1588 about 99.5 +/- .5 (the Genesis itself is set at 99.0 to get said temp on spot check.) that being said I did hatch out 6/7 chicken eggs from my moms chickens that were one day old and all fertile. Again though #7 was fully developed in shell but then died. Can anybody help me out here?! There something on my end that needs tweaking? Would really like to up my hatch rates and understand what I'm doing wrong before incubating with more expensive birds/and their eggs.