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I think you are splitting hairs. These sets were designed to operate over a wide range of line voltages, and differences in components in individual sets will result in quite a variation in DC voltages.
I wouldn't worry about getting the DC just right. Even if you got the 380 v line right, the others won't match what you read on the schematic. Put a small resistor in series with the diodes and you will be fine. In fact, I don't think you'd have a problem with not using a resistor. You might end up with 20 or so volts more on the DC, which won't be a problem.
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