well, i'm only on my second grow, the first time being very elementary with bagseeds, 1/2 MG, 1/6 each peat, vermiculite, and perlite, and fertilized with different liquids. The for the second time i wanted to go more organic, so i bought some feminized seeds as so to eliminate the need to grow more plants than i need to, and loaded up on natural ferts. In 5 gal pots, it was about 40% soil from a local feed store, 20% perlite, 10% peat and vermiculite, 15% castings, and then i put in a few handfuls of blood, bone and kelp meal (blood<bone<kelp), and about 1 Tbsp/gal of bat guano and lime. I started out the seeds in little peat pots and as soon as they had their second set of leaves developed, i transplanted them to my 5 gal pots with my custom mix. After about a day or two (due to what i assume to be the shock of being transplanted) i have 4 plants that are growing very very quickly, and with very little stress of nutrient shock, so i'm very happy as of yet.
If i could change anything, i'd add more perlite and slightly less castings, only because it's water holding capacity a few inches down is holding up very well, maybe too well. They're still young, so i'm letting the top few inches dry up well before i add a little water just around the plant base. i'm just worried about later when the root system is complete and i'm going to have to be wary about how much to water.
I was mostly concerned about all the required micronutrients being covered since every liquid fertilizer will give you the big three (or at least one of them) but they dont cover all the micronutes, which was the basis for my using so many different types of organic ferts. (make sure you use a mask and gloves when adding the bone/blood meal)
just fyi, all amounts above were approximates that were eyeballed for the most part, and yes, i was terrified i had added too much and was going to burn my plants up