A couple posts I want to highlight from my current thread though. When I started the thread, I made a brand new soil mix and throughout make several compare and contrast statements...
These two posts stick out as being highly relevant, without sending you down the rabbit hole, especially since you are looking at working with the basic amendment recipe I posted about 6 years ago.
The take away I want you to see here is the potential lack of potassium in the basic amendment recipe. This is usually a non issue and most people prefer to add potassium as a top feed as needed, simply because it's a rather mobile elements in soil systems and in plants, so you see it's deficiency in OLDER leaves first.
However, with using a blend of time released materials, I've learned how to better address this over the years.