took your suggestion bladesmith... the counterboreing didn't turn out as clean as i had hoped but the sanding down of the bolts worked great...
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If you are still seeing scratches at the higher grits, then you haven't completely removed them at the lower grits. Scratches are pesky. You think they are gone, then they magically re-appear as you get to the higher grits and the fine dust from sanding fills them in and they become more visible. One thing you can do is get better light on the blade--even natural light--and look hard for the scratches.
One thing it looks like you might be doing is short-stroking, or "scrubbing" your blade with the sandpaper. Basically, you aren't running your sandpaper in the same direction for the entire length of the blade. This can happen a couple of different ways--either you are not running the sandpaper the full length, or you are shifting the direction slightly mid-stroke, or you are not keeping the sandpaper backing in full contact with the bevel during the entire stroke. The result is a bunch of fine lines (scratches) that are short, running in different directions along the blades, and even fishhooks. You can see it along your blade--the longer scratches in front of the ricasso suggest you spent more time there (that's a tough spot). There are more lines running roughly parrallel to the top grind line, but they vary 5-10 degrees and don't go the full length of the blade.
Overall, it's a good first effort. The scratches are a picky thing. While TV adds 10 pounds to a person, a large photo online adds about 4 grits to the depths of the scratches on a blade.