What was the humidity for the first 17 days?
59% humidity certainly is not high enough to cause condensation in your average incubator atmosphere. I would bet that your hygrometer is probably close to 20% off. If that is the case, I would say that the humidity during the first 17 days of incubation was too high. Luckily the 25 eggs were porous enough to loose a decent amount of moisture letting them hatch, but the other 15 probably had less porous/thicker shells and did not loose enough mositure. I would say the chances are that when the chick pipped the moisture was enough to enter the air cell and "drown" the chick.
One of the dangers of having high humidity during the first 17 days is that the egg does not loose enough moisture (the reason we control our humidity). If the eggs did not loose enough mositure when the chick pips into the air cell, the moisture/liquid that is in the egg can fill the pip hole and when the chick tries to breath they aspirate on the excess liquid. It would explain why the hatched chicks were extra wet and or sticky and why the chicks pipped, but did not hatch.
