I have been using a Feather razor blade that was supplied with the Masamune but I an not finding the razor very pleasant to use with it as it feels harsher than I am used to. I tend to think it is the feather blade that is causing this as I have not found the feather blades among my favourites with my old DE89 anyway. For masamune users, what blades have you used and found best for you with the masamune?