I recently purchased Slickrock Pearl and printed my first two images with it using images I've printed with Lasal Exhibition Luster and InkPress Metallic. I use an Epson R2400 in Lightroom CC with the latest MOAB icc profile for the paper with perceptual intent and media type set to Luster as indicated. Epson Premium Photo Paper Glossy is used for proofing. In one of the images there is an area of the image where a shade of green loses it's edge, directly atop the bird's head (zoom in two clicks) - https://goo.gl/photos/xz8qPL9pbmc42Dx29. For comparison the Epson Glossy is here - https://goo.gl/photos/b8bPSHNMUTi8U74q6. This has not happened prior and saturation, luminance and vibrance are all in a typical range. Should I try glossy as the media type and not luster as recommended?
Thank you for any help!

Saturated gradations in a printed image are most prominently controlled by the rendering intent selected when printing. I would suggest making a second print using 'Relative Colormetric' to see how your results change. Keep your media setting as luster.

Mr. Moab Paper Support - that worked perfectly! Results are now outstanding and just what I expected from MOAB. Thank you for your prompt response!