So from here, should I start again from the raw file and go through the prosses outlined in Photoshop Workflow (for higher end printing) then do a sample print?
Yes, I’m afraid so. 😐 That will be the best way to make sure that there aren’t any lingering color issues. I’m rather surprised that the colors on the good/final file are getting “blown out” though. I would never have guessed that that file would have caused such issues. I would ask the printer if he has to do any conversion on his end before printing.