Hey Richard,
The angles (from my personal experience) vary between microtech models and individual knives.
My own LCC, which is a combo edge, has an angle of 17º.
I've noticed all LCC's are real close to 17º.
I just happend to have a generic wood base ceramic rod holder that was at 17º so I use that.
If you did the edge on a sharpmaker at 20º I'm sure you wouldn't lose any performance because i\the blade is ground thin anyway.
It might even last longer because of the thicker edge.
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~Fumbler
the crazied knife weilding Sarah McLachlan fan =)