Hi, I'm on day 19 on my second hatch this spring and since the first one went well I follow the same procedure. Last time I had a humididty on 70-75% during the last three days. I am doing exactly the same, same amount of water and three spunches and a clith under the eggs. I cannot get over 68% humidity. Is this to low? Should I buy more spunches and change al the time or should I settle for 68% and hope for the best?