Colors in the Coca-Cola Red arena are well known to a problem on the 9800.
Looking again at some of my 8300 canvas profiles, it looks like your best options may be in slightly desaturating, and going maybe 5 points darker. Sorry, no longer have my 9880 profiles for comparison.
Sometimes you can keep an out of gamut color from going blank by creating a layer mask for a very narrow tonal range in the problem area, then making that area a little darker or lighter, and a somewhat different shade. A good starting point would be a luminance mask, where you greatly increasing the contrast of the black and white mask, then blacken out everything except the area of interest. The concept is: if you can't get a rich color, maybe increasing the overall surface modulation in that area is an option. Perhaps you could simulate the reflection of a different, brighter, in-gamut color over some parts of the red area. Or somethin'.