Is THT the hanging hair test? Assuming that it is, you might consider the fact that a razor can pass that test and still provide a pretty lousy shave. In fact, micro serrations in the edge that can help it cut a hanging hair are just what make the same edge pretty rough feeling. Assuming your technique is adequate, your edge may need some work. I would at least treat it to a good stropping.

This is a pretty good example of why most of the top Honemeisters feel that the only reliable test is "live fire"....how does it shave?

As an aside, have a lot of razors that I can't get to pass a hanging hair test. I doubt that anyone would call these razors anything but great shavers, so I write it off to the fact that I am probably not too good at performing the test. Maybe my hair is no good