As things stand yes I'd agree with that bit their, even the cheapo organic stuff from B&Q, Wilko`s or Walmart over in States, i would think would perform better. I`m sure you`ll crack it but fuck it`s along drawn out thing. I mean how many grows are you supposed go with till it comes good, it just don`t seem right to me. But I've never done this type of growing.
Afton has great soil recipe i think he got from a really good organic type grower we knew on another forum called Bandit. But maybe ask him for his recipe he`s a cool dude and always willing to help. Man those plants he grows with it outdoors are real crackers. I don`t think he does the reusable living soil thing but still he`s a full weight organic grower and he does really well with. Anyhow im ranting on as usual here, but its always an option is that one mate.