Good to see your sorting your venterlation out just let the soil dry out the plant will pick up if you do, then feed it with the fish nuets.
Iv never uesd moss so I dont know what its drainage propertys are like weed likes good drainage.
letting water run from the bottom of the pot is not over watering over watering is when you dont let the soil dry out to 30% before next watering, the roots need oxygen.
I use a moisture meter you get a more of a true moisture level of the soil from top to bottom, only cheap from any gardening store.
As for ph most feeds will lower the ph at full strength, hfig got the right idea.