On our Epsons with Onyx we have our standard profile that we have a Pantone chart printed from, and we also have a "common setting" where in Onyx we bump up every color 15% and we print the chart from that profile also to see where everything hits at there. From this point you can choose either a good color match color, or be able to make a custom color/test from there.
*remember that when you're bumping the sliders up that every color in your print gets adjusted, so plan accordingly