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Yes the line is flat in between any given two points going from spine perpendicular to the edge. I can not articulate what I want to say. I am trying to say that the edge of a smiling blade will not...

With a smiling blade the plane that spans between the spine and the edge is not a true flat plane, it is more like a section from a sphere A blade with a big smile will not lay flat on flat surface....

Do not sweat the center line, just do the same things to both sides it will be close enough. 50 draw files strokes one side then 50 on the other side. Just try to keep it even, your eye is better...

Lay the blade on a flat surface and use a drill bit that is the same diameter to make the scribe line, If it is 1/4 stock use the tip of a 1/4 drill bit to scribe the line. it is not a perfect way...

When I am grinding away on auto pilot, (thinking about dinner or something, it is always food) I tend to grind the heel thick and the the toe thin. I have to make a conscious effort not to grind...

It looks normal to me, curved/smiling edges take a bit of work. I tend to go through iterations of establishing the flats, this shows me where I have to grind, then hollowing. Basically set...