good but colors are so muted

The magnets overall look great. They are made well and the magnet is strong, which is awesome. I'm just a little disappointed in how the colors turned out. They are really muted. Granted, I realize that if a file is made in RGB it must be converted to CMYK which will affect colors and brightness sometimes. But I didn't expect it to be THAT much of a difference. I really wish that during the artwork proofing process, you guys could better simulate what it actually look like printed (with CMYK colors) so we can make adjustments if needed.