So today I ended up soaking his hoof for 20 minutes in epsom salts. Then, that was it. Done. Finite. I'm hoping this is the last of the hoof issues, least for a few months.
Here's photos from today:
Below are photos of the lovely sore that Gus has obtained on his left pastern/heel area. This is why I hate wrapping his hooves, as this is what happens. Poor guy. Thankfully he'll heal fairly quickly without any ill effects.