Do you have a fan in your incubator. If you do I would not worry too much unless it creeps up higher.I have been doing birds for quite a while and personally found that the humidity fluctuations did not affect me too much.I personally have have highs and lows with humidity and still end up with a 75-80 percent hatch rate.As for fans I feel they are my best bet to control humidity. If it is too hoigh I add another fan. I build my own incubators so I comfortable use an old power supply from a dead computer and hook up as many as 4 fans(computer fans) if the humidity jumps. It may be fluke I don't know for sure but it works for me.. Steve(BunkyB)