I'd say to keep your humidity down lower, maybe at 40 - 45 % maximum during incubation, then up to 70% at pip. Don't candle too often either. I know it's exciting to see what's happening in there but every disturbance is a drop in temps and humidity and every shake, a potential threat to developing embryos. I personally have a fully automated incubator so I trust in it and only candle once at 14 days, throw out any obvious no-goers and leave anything vaguely resembling viable until day 25. Unless a chick has externally pipped and gone at least 24 hours since, I do not interfere. Those mebranes are very delicate and very vulnerable to drying out so messing with them really is courting trouble.
From what I have read, a lot of problems are caused by frequent human interference in the time leading up to the hatch so try to be patient and leave the eggs alone. If and only if you have problems on hatch day, any steps you take must be tiny and very careful. If you have external pipping and you feel it has been too long since you saw movement or progression, don't remove half the shell as in your picture, take a tiny piece at a time, while the egg is wrapped in damp tissue and return the egg to the incubator, see how or if the chick reacts, see if your help has given it enough to get out on its own. Tap the egg gently, see if the chick taps back, peep at it, see if the chick answers. If it still alive and trying, let it try. The chick will be healthier and more vigourous for its efforts.