this is a recipe that i like, for my moms at least. I currently have 2 Big ol moms that are over a year old in this medium, and i ONLY suppliment with seaweed. If you like the idea of fox farms then i am guessing you are trying to keep things somewhat natural. This mix will get you through right to finish but, it is very dependant on pot size. I like BIg pots.

promix bx (has a microrizal mushroom within)
worm castings 20lbs per half bail of promix (you can not burm with worm poo!)
blood meal, (you can find organic), follow package instructions,This is the main souce of N
bone meal (you can find organic) Follow package instructions This is the main souce of P
Muriate of potash (not organic) This is your mai snource of K (go light on this) They usually recomend about 1/2 a pound per hundred square feet, so you need very little.
seaweed For all your micro nutient needs (organic)very slow relese

I know this is not what you wanted, but i mention it because it is about 1/3 the cost of using fox farms, or earth juice (if they still make it). It is a very slow release mix, that wont burn. Iuse a kiddy pool to mix it all up and scoop it into the pots. the top 5 inches or so of the pots i use just pro mix. pro mix has ph buffers, some wetting agent, and miccrorize, A benficial fungus. I use large rubbermaid bins for my mom.

I have used the fox farm line in my early days, and i had problems, It is more than likley due to my lack of expierience at the time, as well as poor enviroment, and not knowing my strain.
Just another idea for you to think about