Well I've tried various mixes and come to this conclusion:I'm not sure this matters as most people starting with coco seem to do a 50/50 grow. They start with almost organic style as some Coco mixes have worm cast or compost of some sort and which will feed the plants then they unknowingly take all the work off the microbes by feeding hydro style. But either way it doesn't affect the plants negatively does it?
I been looking at growing styles with Coco as you have Coco hydro, Coco organic then I'm calling it Coco hybrid where people seem to be using a mixture of the two.
I accidentally stumbled upon it being a new guy to growing and I basically grew in compost coir which I was feeding organic but with a hydro watering schedule.
Plain coco with hydro schedule/nutes works best - consistent pH, drainage and Oxygen
The minute you add organics you run into pH/feeding quandary
Bio Grow is great for young plants in coco but that's all