Maybe you could post a picture of the Boker silver steel model thats giving you issues. If its the extra hollow ground 6/8 I believe those should hone up very well. I have one and its the sharpest razor I have. Takes an edge very well. Im pretty sure it was just messed up by the power honing job and you should either try to re hone it by hand or have someone that really knows razors do it. There are plenty of guys on this forum from Europe that would be up to the task. This of course depends on the possibility that the razor had its temper compromised or not.