When I used to run hempies with Vermiculite, I’d always have similar issues with things being over watered… The Peat moss will hold its own with water alone. You can use HP Pro Mycorrhizae by itself and get great results 
No real need for the Vermiculite or Pearlite as I’ve found out myself the hard way as well.
The only thing I’d suggest at this point is either place a fan blowing over the soil bags to speed up drying out 2-3 days time frame between watering. Or transplant into HP Promix Mycorrhizae and give them time to bounce back.
It’s also possible that your given too much water since that is easy to do.