From your pictures, it looks like your farrier is doing the right things to make the angles correct, to reduce stress on the muscles, tendons and internal bones.
My 26-y-o horse has good hoof growth in the heels, but his rear pasterns are dropping - he's losing strength in the tendons and small muscles that keep those angles right.
In consulting with my vet, my farrier trims to reduce the toe length slightly more than typical, to allow more rollover, and uses a shoe that has toe cleats as well as more support in the heel on his rears. He nails it on more forward, to allow the heel to expand and contract more naturally.
My great old boy is retired rom jumping and eventing, but with this good farrier, as well as daily cosequin, pergolide to manage his Cushing's syndrome, and a yearly round of Adequan, he's happy and comfortable tooling around with me on his back in the arena.