The first straight I bought was the one you own. I had a heck of a time until I tried another razor. I have worked with around a dozen or so and have found after about 7 months that that particular blade is very very good, however it takes a completely different technique to use it compared to the other vintage blades I also own. It really isn't that the blade can't get sharp enough, it does. I am convinced that the blade has a certain flexibility to the edge combined with my particular tough whiskers makes it difficult to get a good shave unless I pay particular attention to how I approach the angle and the right amount of light pressure. Strange thing to say but I highly recommend using an older wedge or perhaps get your hands on a wapi because until you have enough experience with a straight the hurdles with this blade will make your experience miserable.
Good luck,
Sean