You want to get that humidity down some. I found that when the humidity is that high, I get a lot of curled toes that require intervention to fix or the chick ends up getting culled if it's too bad.
If you can, get the humidity down to 50-60%.
I wouldn't give up yet. It can take up to 24 hours from pup to zip. For lockdown, your humidity should be around 50-60% in my experience.
If you can post some pictures of eggs that you've candled, that would help.