Take this for what it’s worth, but I just heard back from Greg and he said three clients had tried it with ever-worsening symptoms before they were actually his clients. He (my ex) removed the bands and treated the horses with varying types of shoeing and padding and got the horses sound again. He’s DEFINITELY not a fan of the technique!
I’ve seen him work his magic many times and the key to his success (beyond an intuitive feel) is the willingness to come back day after day and try new things based on the horses’ responses.