I did that. And I get to push-cut sharpness, the weird thing is that it doesn’t get much better on finer hones, unless I strop.

Generally, if you can’t get an edge to refine as you move to smaller-sized abrasive, that’s an issue with temper. Literally, the steel is too brittle and won’t support refinement beyond that point. You can force it to be sharper, but there’s no edge retention. I’ve seen this with knives many times.

In some cases, you can remove steel from the edge and get back to “better” steel. I’m talking about removing a fair amount of steel, though. Personally, I’d try that with your TI. I would use a 140 grit or 200 grit stone when I do it. If you have a diamond flattening plate, you could use that. For your TI, I’d start by removing ~0.5mm from the edge, perhaps. You can freehand it, but if you place the spine on the stone, make sure you tape it. In the meantime, I’d suggest looking for a Japanese frameback that uses Swedish steel. These are probably amazing shavers - close to the Weck. This type of razor is on my radar, but in the distance atm.

Are you referring to the little spots of black steel gunk that someone build up?

Yes.