I had rads very similar to this years and years ago.
Start taking photos every trim cycle. It will develop your eye and put you on the fast track to seeing whether you are improving or sliding backwards. Are the fever rings receding? Are they continually coming in? Is his toe gradually correcting, or no? Etc.
An unbalanced hoof doesn’t happen overnight. I don’t know how much you like your farrier but in your shoes I would be truly unhappy with the farrier for their hand in this.
We all assume our hoof care professionals know what they are doing but unfortunately, barring something obvious like a hoof falling off, most people cannot identify pathologically unhealthy hooves.
I ended up firing the farrier because when I tried to approach him with my concerns he became borderline ballistic. It was hard, but I don’t regret it. Even though we used him for years, he couldn’t fix the issue he was causing or didn’t care to see how he was contributing to it by letting the hoof get so unbalanced. Your photos reminded me of my horse’s back then and other posters are right, visually the hoof is glaringly unbalanced in a way one would expect a hoof professional to have comments on it.
We had to put my guy in steel shoes, with a rim pad. He’s still in rim pads to this day even though it’s been 8 years. The rim pads really helped lift his sole off of the ground and keep it from being sheared by substrate. Full pads did not work for him because his sole was so thin that any sort of contact with it caused him to go from ‘minorly bilaterally sore’ to ‘oh my god did he founder’?
Just remember with boots, they often act the way full pads do in that they interact with the sole. In your guy’s case his soles are so thin on x-ray you may see some discomfort initially. I agree it might be worth cutting camping mats or even yoga mats to get a little cushion between the boot and the sole.
It’s not just the toe that needs to be corrected, I hope your farrier knows that. If I were you and you did not have a dire need to use this farrier, I might casually be looking at other horses by other farriers and seeing how their feet look. So many of these issues are farrier caused. Your horse also needs much more heel and sole depth, neither of which will happen until the toe is significantly brought back. These cases take a long, long time and sometimes their comfort gets worse before they get better, but you should always be seeing improvement every trim cycle.