Cinnamon is a natural fungicide,we use it as a cheap fungicide on orchids it kills root fungi. I use the powder, not the sticks. The sticks are used if you are going to make a spray to spray on, I just dust the cinnamon powder on the roots as a preventive.
Your numbers are high for slow release fertilizer, try something like 8-8-8 or 6-4-6. Less chance of burning. Too much nitrogen will get you vegetative growth at the expense of fruit.
If you are doing this in a basement, then how are you watering. If you are bottom watering or have a hydro system, your mix is probably staying too wet. If it hardens up then your "garden soil" probably has clay in it. clay and sand or even perlite = cement.
Try a mix of 1/2 part coarse multi source blended compost, 1 part peat moss, 2 parts perlite. Set lights 8 inches from top of tray. Use daylight flourescent not LED bulbs. Unless you get grow lights regular LED bulbs do not have the full spectrum of light. Use a fan to provide air circulation and help dry out the excess soil moisture. Drain the bottom tray 10 minutes after watering or use a capillary mat or wick instead. To control fungus gnats, it is better not to have water left in trays, but to water, and let the trays drain on a rack, wipe the bottom trays dry. Test the soil daily to see if it needs to be watered.
https://coopext.colostate.edu/4DMG/Plants/guidline.htm