Actually. I disagree. This is the work of your farrier. When you trim a horse, especially if it intended for a barefoot hoof, you want the "bulge" filed so that the pressure from taking a step works mechanically with the rest if the horse. How to put this simply, I'm really working on it. haha. With those bulges there, it puts a 'break' if you will in the weight bearing force he uses when taking steps...by filing those bulges down to be level with the rest of his foot, so that if you laid a straight edge from his coronet to his toe, you wouldnt be able to see light. (Ideally) Those bulges just puts a slightly extra stress on your horse's movement.
Next time your farrier comes out, say politely, " I read something about this yada yad yada and I want to try and file those bulges down" or something of the sort so that you dont offend him. Im not quite sure if any of that made any sense..if anyone agrees and is able to put is more simple, have at it! lol