I am in Ocean forest with what I had originally wrote down as 8quarts to a bag of soil. However going back today and looking at my inventory I see that I used 10-12 quarts per bag of ocean forest.
I went back and felt the pots and the hardness on the bottom wasn’t that hard after a few light squeezes.
I see you mention porosity I have been watching several videos this evening regarding soil porosity is mentioned often in connection with various mediums. So many soil choices. I just watched a video about subcools super soil which was extremely interesting. My wife just reminded I have been in the grow room/my new office for 14 hours. lol