EDIT: I can see alot of "clay pebbles", are you only using them on the top of the soil, or is there also some of this in the soil mix? I use myself a little soil and some clay pebbles, not too many, more soil than claypebbles, but it looks like you are using some more, is that better than less?
I myself growing my last soil grow, i think, and then i go hydro-ponic, i would guess, when you use soil, it's better to mix som good stuff by yourself rather than buying it to overprices?
It looks like thay take over even when you dont have so many tops, bu isent it better with more tops?