Go with your instincts. I try not to interfere, but sometimes just can't help myself. If you do assist, just take teeny tiny chips off. If the membrane is moist and you see veins....leave them alone. You do not want any bleeding.
Sorry I misread....thought you said humidity was 20....75% is higher than my incubator ever gets. It kinda depends on how much fluid they have lost. I weigh mine when setting and then a day or 2 before lockdown to get an idea of how the hatch will go. Too much weight loss, means sticky...
Congratulations !!!!
Nah not to worry about non pippers yet. They will pop out when they are ready. It's hard to picture how low the heating element is. They don't really bop around much until they dry. If you are worried, increase humidity as much as you can....20 is kinda low...