For one: If the prints look OK for you, then all is OK. For two: Sending RGB files to a printer service provider will result in a brownish black, as normally this black will be converted to CMYK with all colours holding a bit, except when converting to greyscale, where there would be effectively something like a dark grey. You see that brownish blurred typesetting sometimes, especially in ads, where the provider of the file does not really know what he's doing and creating his art in Word. For three: Those dot-gains are paper/ink/machine dependant and the printer should be able to give you the correct values for his configuration, except if he does not understand what these values mean. Generally spoken, they tell the printing machine, how much ink to apply, so that the final result is correct. On your screen, you need to be able to confirm the final print, so that here the system tries to compensate accordingly in knowing your screen type (guessing if not calibrated ) and the compensation intend.
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