That machine stinks at getting a deep red on most of the print settings. Try the "saturation" mode and you should get a deep red although it will be slow
I tried printing photo quality and the red still looks the same. Is that what you are talking about for saturation method?
Been I while since I've used that machine, but I believe it is the highest (slowest) print quality. In onyx there was a checkbox to enable saturation, or it might have been on the job settings on the printer display before you release it to print.
I found the Max DPI Saturated setting. It is definitely the slowest print method but a much nicer red. Thank you!!