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you must be sure that ALL the stones are lapped flat.... you can use a piece of glass with 400 grit wet or dry and a lot of elbow grease... mark a pencil grid on the face of the stone then scrub in...

i think it is more a problem that you are sharpening it like a knife.... try sending it to one of the honemeisters on here and get them to fix it up for you..... then you will see what it is capable...