I think that Gage's approach is the way to go: acquire volumes of the best potting medium ingredient materials you can get, and custom-blend the mix to meet the combination of the plant's individual needs, your growing conditions, and your watering habits. No pre-made mix will be right for every plant or every grower.
There are basically two ways to look at it - customize the media by plant so you can water them all on the same frequency, or use the same mix for all and water them differently, as they require.
Don't forget that the choice of container will also affect that.
And by the way, without a doubt, THE BEST bark is Orchiata, coming out of NZ.
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sunset360 
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