Sunshine advanced #4 is not a coir based mix, only 20% at the most. It is almost all peat and perlite.
I used sunshine advanced #4 for a while, but I stopped using it and went to compressed coco coir bricks. Sunshine advanced also has terrible quality control IME. I would get some bales that would work just fine, but some the pH was just awful.
Have you ever seen the autopots system? I used 50/50 coir/coco in them and it turned out really well for me.
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