I've never understood the relative unimportance of focus, registration and color. Nor do I understand the recent centering mania such that people pay multiples at the same grade level to get a few degrees better centering. So I guess I can't help you there.
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Net 54-- the discussion board where people resent discussions. 
My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
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