I've got a Kikuchi Carbon Elite Gyuto that has lousy edge retention. I've stayed around 15 degrees, reground and thined and worked the stone progression from 220, 1000,4000 all on Shapton glass stones. While I can get a great edge it wont hold for more than a couple of hours of professional prep. I'm using Boos boards for most everything, I've got good knife skills, dont abuse the edges and yet cant seem to get any life out of this edge.
As a comparison my Fuji and Yoshihiro stainless gyutos have substantially better retention.
I get this is SK4 steel, the same as my Fuji carbon Suji which actually holds a great edge, did I just get a dog with this Kikuchi ?
Any input or advice would be great.