I don’t have that model, but I assume that the driver is similar to others, and the Epson PrintCD software should be the same.
In the PrintCD software, simply select “Premium Disc” in media type, and use the “color correction” slider to increase the density one or 2 notches.
In the printer driver, you should use Adobe RGB color profile, not the Epson profiles, and probably Gamma 2.2. You can further use the color sliders there, but if you are using “best photo” option, it shouldn’t be needed.
Be careful with increasing density with the Epson inks, as they can get too thick on some type discs, and be sticky for quite some time.