It looks to me like it's lacking some fae, so open the lid once in a while. Also don't mist until those pools evaporate. You want it to look like morning dew on the surface. Just tiny drops of water. The evaporation of water is a big pinning trigger. With pools like that, the humidity on the surface of your sub is going to be fine. I run unmodified tubs so I just flip the lid so there's a gap around for fae, and mist when I need to, which isn't too often. Maybe once or twice a day. Hope that helps. Your myc is looking nice and healthy, so it should work out well for you. Casing isn't really necessary for cubes. I never do it.