They say the best way to determine if you need to water is by the weight of the pot and plant (just the plants pot, not any decorative pot it may reside in). Pick it up and get a sense of the weight before you decide to water. When you do water, judge the weight of the pot and plant after it is watered.
You can also try to poke your finger into the media and see if it is dry.
Since you still have moss in your mixture, it may retain more water than you expect. Is it a lot of moss? I found here in Colorado, I need some moss in my mix as we are very low humidity.
Others with far more knowledge than I will also chime in with advice.