Incubator issues!

Hello, so, I am having a few issues! I have this exact incubator in the pic I have added however, I am having serious issues with hatching the babies fully. They are full term and will pip just fine then they die inside! What am I doing wrong? I have the temp set to 38-39 c which is 99-100 degrees, I have the humidity set as high as this **** thing will let me which seems most happy at 60-61%. I do live in Colorado and our humidity is VERY low here and I am pretty sure these poor babies are just sticking inside their shell and unable to break free. I have tried filling all slots with water, adding 2 wet sponges, and even have to put a bowl of super hot steaming water in there just to get the humidity at 81% for a very small window of time. Why isn't the humidity staying in this for longer? Is there anything else I should be doing?

Thank you!