Rich, I' ve found that the angles do vary sometimes but not all the time. Don' t know what it is exactly. And yes, any blade over 4" is stretching it' s capabilities.
As far as diamond sleeves/ stones in general, they are a plus IME. It allows for quick removal/ reprofiling and for starting up very dull blades.
I recommend the Spyderco units over the Lansky clamp system.
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