My last batch of chicks I incubated were huge at day 21 some did not make it they were fully dveloped but to big, I ended up helping some out after I saw that the first ones could not get out . Could this be the temp or humidity a few were normal size and hatched alright. Any suggestions on what I might do different this time the temp was 99.5 three thermomiters and humidity was 30 to 35 % the first 18 days 55 to 60 during lockdown I have some in the incubator now and would welcome some advice on what I am doing wrong these are shipped eggs. Thanks