I am dealing with a similar situation. I can't seem to keep the wall to be able to grow down before it starts peeling back and breaking off again. This started happening for my horse in September. We were diligent about trimmings and seemed to be doing great .. barefoot. However, 2 days ago he is starting to really tear them apart again. My farrier is coming this week to re-assess him.
I think in my situaion I will either shorten my trimming cycles to every 4 weeks, or some type of GLUE ON shoe. Might my pricey but I will not put nails in his hooves with the way they are now, the whole hoof might just fall apart. So I will discuss my situaion with my farrier but it may be an option for you aswell. Best of luck.