respectfully, "I think they are" is not good enough. You have to be sure. If you look at the edges of the hone, you must clearly see evidence that the 90° edges are chamfered or rounded, so that the edge of the razor can't bite into the hone, as you do the X-stroke. It's easily fixed with a bit of sandpaper, if needed.
You said that the razor makes a different sound at the middle of the hone.
That's not good. That Reynolds doesn't have a smiling edge, does it? Because that requires a variation of the X-stroke, called the "rolling X-stroke". Not really advisable to for a first honing job.
It's also possible that the previous owner lapped the Norton on cheap sandpaper, and that it has some foreign grit embedded. It wouldn't hurt to give it a good scrubbing with a nylon bristle, under a running tap. That's generally recommended to deal with such problems.
You should not set that bevel on sandpaper. Not because it's not possible to do it that way, but because it's going to be far easier to do it directly on the 4K. (Not quicker, but easier)
Make sure that 4K is fully functional and get to work. Stay on it till the job is done. You will get there and it won't take you hours. Doing a bit of this, and then doing a bit of that, is never a recipe for honing success. The Norton 4K is what you got, and it will do the job.
The method for doing a lot of work on the 4K is in a post I made to another thread, a few days ago.
http://straightrazorpalace.com/works...tml#post291191
I don't think you're that far away from a good bevel.
Good luck,
Bart.