They dry out too fast

[Tikva]

Really. I stick my fingers way down in the mix and it's dry - after a day or 2. Pretty much all of my orchids are in a mix of medium / small chips, charcoal, perlite.... a few have some spagh as well.
I tried potting a few that liked more moisture in spagh but this very wet spring, a few of my orchids in the spagh got moldy and or mild black rot. It just did NOT dry out! I got fearful and ditched potting in spagh...
So it seems I have to sort of water my orchids every few days. I drag it out to twice a week and they look fine, but the medium is REALLY dry...
Is that bad for them? And ummm... where is the happy medium....