I read that you use a PH of 5.8? this is for Hydro. Soil should be 6.5-6.8
Try and raise the PH you should get a better yield/quality after correcting to the right PH.
I always yield about 5 ounces a plant but this is my first time in soilbeds so my expectations of what Im gonna get from a two foot plant is lower but Im good in the YIELD and PH department