It seems that your problem may be one of two things.

1. A tempering problem. Either the razor was heat treated but not put back in the oven to be tempered to a softer HRC in which case the steel will be hard & brittle or the tempering may have been performed incorrectly resulting in a very tough steel that abrades very slowly. The most effective solution for this are DMT diamond hones.

2. The geometry may be off. If you can measure the width of the blade and then divide that number by the thickness of the spine. If the result is greater than 4 then the angle of the bevel is to shallow. It will result in a very wide bevel that takes a long time to develop via honing. If so them multiple layers of tape on the spine will be required.

Just my $.02,