[avalon4]

I would suggest that you fix the gamut before submitting for printing. The tricky thing about printing though is, it will never match what you see on your screen. You're talking about two different colour modes. Your screens preview RGB and printers print in CMYK, so there will always be a shift of sorts. Inks, papers, presses, all come into play and vary from printer to printer. You can take the same page, give it to 5 different printers and get 5 different results. I would suggest if you've found a place where you're happy with the colour, stick with them.