Blueberry is having a drainage problem. please help.

I have some blueberry and some strawberry cough 30 days into flowering. Transplanted before starting 12/12 cycle. When i was transplanting i ran out of perlite for the last plant. had to use mostly dirt. Now the plant is barely draining any water and it is causing fungus knats to develop on top soil. i know how to take care of the knat problem. i mostly have, but i know they will keep coming back if the soil is staying moist. My main worry is that my roots will rot or mold will infest my soil and roots. The girls look great and i don't want to lose this one. any ideas? thought about transplanting that one but know its a huge stress. but is the drainage problem a bigger one?????

well, i have figured out that the organic miracle grow i have been using has caused the knats.... learned from other growers on forum.... i also learned to put dish soap in the water to help with knats and drainage. also put sand on top after removing the top soil. no one seemed to help me with this but i figured it out... hope this helps someone else.

yeah, mix sand in it. Or just get more dirt, plain and simple

good luck on that