Philidelphia Instruments sells lab-grade thermometers and hygrometers at reasonable prices, check them out. This has been an awful hatching season for most of us that I have been in contact with. Our production was about a third of what it should have been. So many clear eggs and fully developed eggs not hatching is across the board and late hatches are baffling. I had a few peachicks hatch out on day 32 and 33 and many that pip and not zip, those are the ones I had to tape the toes and work on the legs. Lowering my humidity in the incubator to 40% fixed the rough navels but the rest of the problems remain.Too high of temperature and high humidity can contribute to crooked toes and splayed legs. You might want to get an independent hygrometer and salt test calibrate it and a reliable, accurate independent thermometer that has been calibrated.
I have a friend who raises peafowl, and she too has had a abnormal amount of chicks with leg problems this year.