I have had great success with
1 Part Pine Bark Mulch
1 Part Granite
1 Part Hydroton (a fired clay product often used in hydroponics. Looks like coco puffs cereal). I am also intend on using Turface MVP this coming year in part to replace the Hydroton.
I wish I could take credit for this great mix but I cant. Its Tapla's. However the Hydroton was my substitution for Turface at the time because I couldn't get it. Now I absolutely love Hydroton.
The 1 percenter in me still throws a scoop or two of my special homemade compost in the mix although Tapla would disagree. I have also found that a "mulch" of compost on some of my potted fig plants seemed to improve their overall health. But its only a guess, its way too early to conclude the compost had anything to do with it and those plants in particular were not in the "Taplaesque" mix. I am planning a different fertilizer regimen this year that will include micro nutrients so I can probably avoid the compost and save it for the garden.
Anything with peat, sand, manure, compost, perlite, cocoa shells, triple mix, etc in my original mixes I have noticed that it seems to disintegrate around the tree and collapse. The mix above has held up really well for me and its a keeper.Keep in mind there are positives and negatives with everything in life and the mix is no different. I can list my observations if anyone is interested in hearing more.
Sorry I sort of sidetracked us.
Nas