Here is my current recipe, there are 13 separate ingredients
7.25 gallons Lambert 111 organic mix (peat & 15% perlite)
1.5 gallons Coast of Maine Penbobscot compost blend (sometimes a little more of this)
2 gallons Perlite
3 quarts coarse Vermiculite
1.5 quarts Worm Castings
1/2 cup Blood Meal (8 tablespoons)
1/2 cup Lobster Meal
1/2 cup Seabird Guano
1/2 cup Alfalfa meal
1/2 cup Kelp meal
1/2 cup Dolomite Lime
1/4 cup Azomite
1/4 cup Langbeinite
The goal is to have about 26% Perlite and 7% Vermiculite for 33% total drainage/aeration. Some of the ingredients make a huge difference, I just switched to Lambert 111 from Promix Organik MP as the base mix and the difference is dramatic, the plants are staying dark green until the end of flower intead of yellowing at week 5. Everything else was the same.
This mix is good for seedlings and flowering, but for really high-feeding strains I add another 1/4 to 1/2 cup of Lobster Meal. The individual fertilizers don't matter that much, Espoma Plant-tone works well too, I would use about 3-4 tablespoons of Plant-tone or any dry nutes per gallon of soil with 30% drainage material.