My Epson Metallic Glossy paper arrived yesterday and today I had a chance to print. My first results have far too much magenta and when I adjusted the slider in Lightroom the effects were minimal. I know from owning an older model Epson printer this was my printer having control of the printing process.
So, I gave Lightroom control.
After that was corrected, the image looked almost exactly as it did on my screen, it was only a matter of making small adjustments and fine tuning to get the print looking right.