I tried to run dry incubation and keep things in the 30-35% range until lockdown (did the salt/water calibration, so it should have been accurate). A few of them were a little more "gooey" than others, but being new to this I don't know what is a 'normal' amount of goo versus what is too much.
I haven't had good hatches with anything over 30%, I've tried to keep it under 30, and recently have had my first hatches that I kept at 20% and they've been my most successful to date. There really shouldn't be any goo, the chicks should come out looking wet but any goo is extra and probably an indication that humidity is too high. What about the chicks that pipped internally but not externally, did it look like they had clear nostrils in order to breath or is it possible they had too much goo and drowned? I had a lot of those before I figured out that my humidity was too high...