I bought a Japanese plane a few years ago, and didn't really spend a lot of time researching before I started using and sharpening it. Now that I have a little more time for woodworking again, I unpacked the plane and noticed that the flat part of the back (ura?) of the plane blade is very large compared to 'model' photos online. Additionally, when I try to flatten the back, the left-most and right-most part of the edge doesn't get sharpened, as the back must be a bit convex?
Can I fix these two issues somehow? While googling I found some references to 'tapping out' the blade but I'm not quite sure how to proceed or whether it can even fix my problem. Ideally I'd like a link to a comprehensive guide or similar.
This is the back of a 'model' blade (https://brianholcombewoodworker.com).