I have a new Boker Congress Carver with 1095 steel blades. My new hobby is carving. I carve simple stuff like boats and sharks. It looks like the blades are at a 20 degree angle from Boker. It is dull and can not cut paper. I use a sharpmaker to sharpen. What would be the best angle for carving with 1095 steel, 20 degrees or 15 degrees?