Former GIS guy here, I've modeled and mapped hundreds of rural jurisdictions so I'm familiar with what you are trying to accomplish. Not sure how comprehensive USDA soil surveys are these days as soil conditions can be hyper local (down to the feet).

Many of large ranch lands and farms are going to be listed exclusively by a certain broker which may require website scrapping at minimum and or heads up data entry at worst.

Colorado:

https://www.ranchland.com/

For general usability, I'd suggest at a minimum adding State and County lines, and further, census place points for labeling.

You've included some interesting filters that's for sure.

And of course my usual plug for a great mapping book - How to Lie with Maps - https://press.uchicago.edu/ucp/books/book/chicago/H/bo274005...

I'd be willing to give you input.