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It’s personal preference, as long as it does not hit, keeping the heel off the stone it does not matter.

Just ink the stabilizer and if it hits you will see it and know where to remove a bit.

Looks good, but you might thin the stabilizer tapered towards the edge, hand diamond file or very light touch with a slow spinning fine grit drum on a Dremel with the blade flat on the bench.
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If you do end up removing a lot of the stabilizer, I use a Dremel with a fine sanding drum at slow speed, and pay attention to the direction of rotation, for just the thick part of the stabilizer.
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I would trace the shape of the spine with a pencil on a piece of cardboard.

Cut out the cardboard and trace the curve onto the spine with a sharpie, so you remove the minimal amount of steel,...