This may not be what you're looking for but my mare used to rip her shoes off and need them redoing more often than usual. She wasn't happy. She too has the same, poor conformation.
I took her shoes off and the change in her was massive. She was very sore initially, she was 19 at the time and had been shod the majority of her life.
She's now 22 year old, I feed her a low sugar and low starch diet which contributes to health hooves. Also, I feed her seaweed which contains natural biotin. This is used to grow mane, tail and hoof horn.
They do make boots now which can be used for a wide range of activities and so far, the scoot boots are on top. Light weight, durable, hard wearing and cheaper than shoes.
I would get a farrier in to look into why the hooves won't hold a shoe and in the meantime go barefoot and put on a supplement for Hoover growth and use hoof ointment daily
Any suggestions?? I'm thinking we should let her go barefoot for a couple month so and let her hooves grow out