Deformer drastically simplifying shape of pencil line

I’ve drawn fingers and need to have separate line and colour art for autopatch with hand. The thumb has no autopatch. When I rig with bone deformers the finger shapes loose shape and become very simplified. I’ve added more points to the art layers but it does not change anything. This is just the pencil line. The brush line works fine. I guess I’ll have to use that in problem areas, though it’s a compromise I’d rather not have to employ. So far the results with the pencil line are not usable. It doesn’t look like the approved model anymore. The bone influence is set correctly as far as I can tell. I’ve been successfully using Harmony since December 2013.