I haven't noticed a problem with the mix getting wet at all. The water seems to soak up nice then drain when full, maybe the perlite is helping as well as the compost. My internet service has been playing up lately and i am on holidays still so have been relaxing
Got my worm farm producing jizz and made a couple of aero/dwc hybrid units, they seem to be going good.
That's what I want my mix to do! It actually does do that, so long as it doesn't get too dry. Once it dries right out, that's it. Pretty much gotta soak the pot forever to get it to start absorbing again.
I always use perlite too but doesn't seem to make a difference (if anything, thought about ditching it so my mix will hold more water!)