I took the top off a little to let out some heat....I was in lockdown on day 20 and I saw no pips and the humidity had gone to 80 percent and it dropped to like 71 and I thought that was ok since it was too high anyway. I tried to lower the temp without opening and it kept going up even with the incubator set on 80 degrees...so I did open it a little and then I noticed a chick pipping at that momemt.
I had to assist it today because it was stuck and so far it is doing ok...but I have duck eggs and other chick eggs in the incubator that all should be hatching today....
If you caught the temp fast enough it should be ok, i would be worried about the humidity right now