On the upright foot, John used an open shoe and a flat leather pad. The knees were then in line. When asked why he didn't use two bar shoes, John explained that the dished foot would gain a lever-like action from the bar shoes, causing it to shorten strides and possibly pull the shoe on landing. Hot fitting is a good practice when shoeing potentially lame performance horses. It seals the horn tubules and gives a good surface, so there are less broken walls.
Hocks require lameness prevention and maintenance care during shoeing.
Heel support will help the hocks. Foxhunting horses are usually bigger and heavier than show horses, but many of the same principles apply. They are shod with steel all around, and the farrier should be working on helping the horse with breakover. The larger shoe gave the horse more heel support. Calk placement has less to do with lameness problems than which calk is used in the hole.