If I may make a suggestion: stop using scribe lines, and start using your eyes.
If you look at your razor from different angles, and along the edge, you will see a lot more than a scribe line ever could, and you can easily tell if the edge is straight or crooked. Also if you want to keep an eye on the geometry while you are grinding, all you need to do is just lay it flat on your bench, and keep an eye on how the razor would 'roll' if you were honing.

I used to make scribe lines when I was making my first razors. But the problem I was facing was that I forge my razors, so it is not possible to make scribe lines and measure parallel lines or right angles. Learn to look at your razor, and you'll start seeing everything you need to know. Scribelines and jigs are crutches imo.