I make my own. 3-5 parts fine bark,1-2 parts perlite(or 1 part perlite 1 part pomice) and 1-2 parts peat. A very FAST soil mix that needs lots of nitrogen because the bark sucks up nitrogen and then after it gets it's fill ,bark turns into time release fert. as it breaks down. Good for an easy 5 yrs. It needs/ has to have daily waterings with a light 1/10th dose of ferts. I add a pinch of dolomite lime and bonemeal when I mix it up. Manzanos especially love it and Chinense too. Lots of root space and it doesn't allow wet feet for my plants. For Annuums I add a little more peat since they seem to like it less dry. If I have the $ I add osmacote to the mix.
That sounds like a good mix, on the acidic side. I too use Osmocote "Loews" always has sales on garden nutes. Sometimes outrageous prices. Last week I was browsing thru and noticed 10 lb bags of indoor/outdoor Osmocote marked down from $27 to $6.97....I bought all 4 bags.....I would have bought more if they had it. The stuff works well , in my opinion. It doesn't burn the roots. I added it to my overwintered plants and they starting to fly with growth...
Good luck with your Manzanos. I grow a "Yellow Perrins"...its very apple like in shape and flavor.
Greg