Attention to foot balance appropriate to the overall confirmation of the
horse, (this usually means taking more toe off), making sure the break over
isn't creating a shearing effect, and that there is sufficient heel support
to keep the horse's feet UNDER him is a good first step, followed by
training the horse to carry itself in balance and riding the horse to keep
weight balanced toward the rear whenever feasible.
I have found the same principles to be true in dealing with brushing
problems. Farriers are understandably reluctant to take toe off if there's
a chance of BLOOD. I finally solved an interfering problem by letting the
mare go barefoot until she wore her own toes down. We shod her from the new
angle (MUCH steeper than ANYONE would have guessed ) and no more problem!
I've also found that fitting rear shoes full on the INSIDE can resolve
interfering problems -- hate trailers (anything angled) -- too much twist.
Used to hunt for Standardbred farriers. Current artisan is a "Games" horse
farrier. I've learned a new dimension for the need for balance!
O.K -- all that just to get the discussion going! Am I a farrier? Heck no,
but I've spent enough in the last thirty years to know what is needed and,
usually, when to stop telling the farrier what I want BEFORE he hands me the
hammer!