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The problem seems not the size, but the steel. There is more than enough 5/8-12/8 'razors' that cannot hold an edge either.
My guess would be somebody messed up the temper of your Wostenholm, they...

not a world of difference, but it's certainly noticeable difference for me. and I like 6/8
the most popular size of razors is 5/8 so I consider it the 'standard' for this only reason.
whichever you...