I like the Naniwa Advance stones for razors. Good value IMHO. The binder in the Advance loads up easily, so I always recommend a good amount of slurry on each stone until you get to the finishing stage.
I’ll gladly be corrected by any Honemeister who actually knows what they’re doing😅
I would not use Honemeister and knows what they’re doing to describe myself, but here goes:
Since you have already honed quite a few razors, I'm leaning towards steel temper as the problem. An easy way to tell is to go back to the 1K stone and don't come off of it until it push-cuts a packing peanut. It should take a little effort and the peanut may make a sound when push-cutting, but the razor should cut. Sample cuts from heel to toe should feel the same. If the razor does not push-cut, then try to inspect the edge with a 25X loupe, or equivalent. The texture of the apex relates to the abrasive size of the stone, but temper issues typically prevent the edge from taking the smooth form that you expect. I suggest using Sharpie, also, just to have a visual check on overall geometry.
If the steel is soft then half strokes on one side of the razor will easily form a burr that you can feel with your fingers. The burr will be on the side of the razor that faced up during the half strokes. With soft steel, this burr is easy to flip (with half strokes) from side to side, and it is very difficult to remove with alternating strokes on the stone. Here is a video that talks about feeling the burr. Go to about the 29 min point.
Hope this helps!