I use a Smith's sharpening system- the one with rods attached to metal poles that slide through guides allowing you to sharpen at 20 and 15 degrees. I've used it for a while now and always attain excellent results...
Except on my Sebenza. I don't know what the deal is- I've done everything I possibly can think of: sharpened at 20, sharpened at 15, used the coarse stone plenty, used the fine stone plenty, started at 20 and ended on 15, started on 15 and ended on 20, stropped, didn't strop... and all that keeps happening is the blade tending to tear instead of cut.
It irritates me that my most expensive knife is also my most problematic. I need to send it in but I can't even afford the $30ish round trip right now.