Thin lines inside letters when overprinting

hello all. I overprint a K area with a C one (40%C, set to multiply), both containing the same text white in the same position, plus 0.3 border in C (sort of manual supertrapping, I don't trust the printer in the case at hand). Looks fine in InDesign, but Acrobat (as well as Preview) show very fine contour like lines inside all letters, no matter what typeface (strangely, small caps are not affected). Acrobat's Output Preview even gives values for them (between 13 and 35 K).
Profile: fogra27 // InDesign 7.0.2, Acrobat Pro 9.3.4, Mac OS X 10.6.4
Very bizarre. Any idea would be most welcome.

good idea. The OBS is small caps.

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