“8 large bags of a high-quality organic potting soil with coco fiber and mycorrhizae (i.e., your base soil)
25 to 50 lbs of organic worm castings”
Just guestimating here, the foundation of subs formula is Premuim Soil (like Promix BX) + 15 To 25% EWC by volume,
That alone, will make a huge difference in P & K uptake EWC makes PK easier to uptake. As well as a huge microbe population.
From there you could adjust your other Macro Nutrients and Trace Minerals.
Just throwing it out there, but you could eliminate a few things and use others like bone meal, If you wanted to use traditional hot compost that has eggshells to replace bone meal, and I prefer veggie based compost over any guanos or manures. I would rather use kelp meal over blood meal,