Hi and welcome to BYC We're so happy you've decided to join us
How often to add water tends to be tied to the incubator and it sounds like you've already figured that out. I have a humidity pump that takes care of it for me. Your eggs should be fine. I keep humidity for duck eggs between 40 & 45% until lockdown and then bump up to 65%. I also run my temp at 99.8*F. Did you calibrate your hygrometer? If not, do a quick search "how to calibrate a hygrometer" on this site and follow the instructions. You'll be glad you did.