What the problem is in this case I don't know, but I do know that the Dovo "best quality" is far from that, I've had serious issues with several of those, especially warped blades.

The angle could be a problem, to ascertain this you can use the angle calculator that's somewhere on the internet.
You could also send it back to the previous honer and ask him to look into it, they should be able to tell what's wrong.

Could you show a picture of the razor? Just to see how much of it has been honed off. I remember one razor that had pretty extensive honewear. Whatever I did, I couldn't get a stable edge on it. According to a friend I could have been honing in a zone of the razor where the steel was not hard enough.