I think so. I have had some terrible hatches and I really am starting to think it is the hygrometer/thermometer. I got a hovabator and my hatches are still not great. So I am going to invest in a new hygrometer to see if that helps.
My last hatches were not really good either, but I think it is because they were shipped eggs. I have 2 hygrometer/thermometer's in my bator. I haven't had any problems with mine. Sorry that you are having issue's. Seem people use those that come from the cigar shop for about $35