I have a big announcement! After a few more hours of gameplay, I finally found some High Fertility Soil! Of course you find the things you want when you're not actually looking for them. It was a few pieces up on a rock outcropping in a Common Rainfall region that was oh so shamefully close to my base. I think my error was trying to focus on regions with heavier rainfall, and not paying more attention to the Common Rainfall regions as well.
As others have stated, I have had worlds where I swam in Terra Preta, and perhaps, that has spoiled me and skewed my perception as to the availability of High Fertility Soil in 1.19.
Thank you everyone, for joining me on my epic journey.
Now, does anyone know where I can find a functioning pair of eyes?