Gene Ovnicek has a few good things to say on toe first landings, navicular syndrome and hoof mapping. He is a highly respected American farrier who confesses to doing as he was taught with these horses but now does things differently. Ultra-sound has made a difference in the approach to dealing with navicular syndrome horses. One of the things they have learned is that bone remodelling happens in only 10% of the horses diagnosed as having navicular. What has been learned is that it is the supporting tendons that are inflamed. So if interested, research on youtube about hoof mapping. Gene likes to see the heels brought back to 1/4" below the heel dimples. No longer should horses have their heels elevated and altho it may alleviate the problem now, it will worsen in time.