mabee ck cocco , most of the most productive growers i know all use coco , i went to
promix on my 6 k in 7 gallon pots and yield was less ....not as stable soil, but tupor makes coco "gold bag " it with everything in it , perlite , ect...bag to pot no problems
also use a vversion of lucas formula for nutes ...been working great ill post some new pic at 33 in flower , already 5 ft
tall.....this last 4 weeks they will swell crazy