re: A Cure for Arthritis?

Since I’m a noob at card scraping, I have a question. Based on the sharpener I received from Jack, the burnishing pin is vertical and there is a ledge that guides the scraper along the burnishing pin. The ledge is about 75° off the pin. Not quite perpendicular. When I use the scraper, I pull it at an angle of about 45° do the burr really digs in and I get shavings. I’ve heard others day to bow the scraper slightly but that would only make sense if you pull the scraper perpendicular to the material. Am I doing something wrong? Maybe I’m just not sharpening it enough (or correctly) to pull it perpendicular? What’s the best way, or at least the generally accepted way?