Footsteps of the Rabbis...
Josh,
You follow in the footsteps of the Rabbis who use coticules to sharpen their 18" knives for kosher slaughtering of cows and other large animals. They use narrow stones as well because they hold the knife steady and run the coticule down the edge of the knife to hone it. This is the general method for honing long blades and it transfers to your particular practice of honing only a small section of the straight razor at a time as the blade is warped or curved and won't sit flat. I applaud your problem solving ability!