Potting mix suggestions

So heres my situation.

I have some heady plants that I am gettin ready to move outside and into huge containers.

I used the regular MiracleGrow soil up to this point and the plants dont seem to like it too much, they are fine but could be better.

So it seems everyone suggests creating a custom mix. That seems pretty complicated. Is there any ready to use soils that work great with cannabis? I heard that Organic Mix from MiracleGrow works nice. Any advice?
 
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