We have a TB ex racer who had shocking hooves. Always craking and loosing shoes. Very expensive and drives you mad!
We have now been using a hoof oil for about 1 year called 'Worlds Best Hoof Oil'.... its Australias No.1 selling hoof oil and is recommended by farriers and is now sponsoring a top Aussie eventer.
I am a Veterinary Nurse and am normally totally against hoof oil, but I was desperate. We were in the same boat as you, we love our boy to bits, but the farrier was always out and we were always loosing competitions fees from where he would loose a shoe last minute and could not compete.
We have had no problems with him for about 9months now (touch wood!) and the farrier is coming out much less, about every 5-6weeks (which is still more than the others, but affordable!)
We now sell this hoof oil as we are so so pleased with what it has done for our little man. We can not guarantee it will work on your horse, but we are hooked on it!
Our online store link is as follows: www.equineandcaninesupplies.co.uk