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You mention the mounting plate and rotating it to switch between 140mm and 160mm. I have the RS-785 post mount brakes
I'm afraid I can't tell what mounting plate you are referring to, pretty sure mine are just attached directly to the fork mounts
http://si.shimano.com/pdfs/dm/DM-BR0008-08-ENG.pdf
The flat mount versions have a reversible mounting plate by the looks of it.
Saffronspokes
YEah you have to use that lockring. Fit a 140mm and see what happens, the calipers were designed to run 140mm or 160mm, just rotate mounting plate to adjust. I wouldn't put a washer on, the rotor has to be where it is to work with the caliper, plus you will knowck the dishing out, plus put stresses on the fork they weren't designed for (albeit minor).