Thats the problem your using mg african violet soil..... who told you to use that plus Im pretty sure its slow release ferts ditch that soil dude its horrible buy yourself a quality soil......
Ohhh yea, that's part of the problem for sure even if it hasn't actually become a problem yet. Miracle Grow is like cheap whiskey to Cannabis plants. Scratch that. Bathtub whiskey.
If you like using perlite, grab a couple bags of Fox Farm Ocean Forest and mix it with perlite. It's pre-charged for the first few weeks of veg.