Sorry posted that before I saw your towel test response. Sounds good!
Many people incubate at your humidity readings and have no issues whatsoever, like I said you’ll have as many opinions about this as there are people on BYC.😊
You can still salt test your hygrometer to check it for accuracy. It is easy to do. I just did it with two I got in the mail yesterday. One was off by 3% and one was off by 4%
They were reading high so I just have to -3 or -4 on the readings I get.😊
You will get as many opinions on this as there are members on BYC! I dry incubate because my ambient humidity is high and I usually have between 35 and 45% for the first 18 to 19 days and then go up to about 65% in lockdown.😊