Humidity drops with ecoearth - doing something worng?

[kiiarah]

I recently switched Shesha from aspen shavings to ecoearth due to difficulty getting the humidity high enough for shed periods. The stuff definitely gets high, after a good misting it will jump to 80% (I am still learning how much to mist to get to the right range) but I have been noticing that it also dries out fast and severely. For instance, I have been misting before bed to bring it to about 65%-70% but in the morning it will be down to 40%. Does anyone who uses this have any recommendations for maintaining a stable high humidity with it? I can mist as needed on days off and when I am here before and after work, but during work hours and overnight I need to keep it from plummeting like this. Could it be that the lower layer is still dry after misting so once the surface dries there is no moisture? Any suggestions would be great, I like it so far I just can't seem to get it to retain the moisture for some reason.