lets clarify something..........
the ONLY (!!!!!!!!!!!!!!!!) place you will see any reference to the custom printer profile you made is in Photoshop's print dialog (first thing after cmd-P).
The Mac printer driver ONLY knows about Epson papers. When you printed the targets for the custom profile, you *must* have selected an Epson paper, that serves as the base type and is what you need to re-use when you use the custom profile.
This is exactly the same situation if you were to be using some 3rd party paper (say Canson). On Canson's website, not only is there the profile for the paper in question but some additional 'instructions'. Those instructions contain the important 'media type' you would select (in addition to resolution, high speed, etc etc).