I'm in the process of building two wardrobes using hand tools only. The problem is while cutting the dados in the carcass I'm getting an unacceptable amount of tearout on the shoulders. Both left and right knickers are sharp, or at least as sharp as I can make them. The iron is sharp, half inch, in width. The lumber is pine, which, I know, is prone to this problem, but still, it seems a lot. Any ideas?