I was the same as you at first. I was at about 55 but after reading why everyone else said, I opened the vent about 3/4 of the way to maintain around 45-50 the whole time. When I added water to B and the chicks started pipping it’s been about 72. I haven’t really been able to get it lower. When I woke up it was 74 and I was nervous it had been that high all night. I read other posts and think it was ok but I still tried taking some water out to lower it to 69. I felt like I almost took all of the water out hope the rest of these little ones are ok! I think I just added too much water at lock down and should have done it slower.
I added water to Side B during lockdown. My humidity has been around 68-69%. Whenever I add water, it drops to to around 65. Even though the water jug is literally sitting right next to the incubator since I'm trying to keep it at room temperature. It only drops for a minute or two and then climbs back into the upper 60's.
ETA - in the time frame that I started typing this message....I GOT A PIP!!!