An OEM inkset will not print well on Arches watercolor paper. I use Hot Press 140 lb. fairly regularly. I also, however, use a custom black and white inkset and QuadToneRip to do this.
There are several issues with Arches. First, to get a good dmax you need an inkload of about 125 (plus or minus) for the MK ink. This requires two MK positions. (I use K and Y.) With two MKs you can pour on enough MK to have an Arches print look very good. The second issue is that Arches is not an inkjet paper. Inkjet papers are made to pull the fluid straight down into the coating quickly to stop horizontal spread -- aka bleeding. In the deep black, this is seldom an issue people will see. However, for the midtone grays/inks a low ink limit is needed. Good luck doing all this with an OEM inkset. I don't think it's possible to get a first rate black and white on Arches from an OEM inkset, but maybe some creative profiling will be able to do it. Because I don't use OEM inksets, I have not tried.
See
https://www.paulroark.com/BW-Info/7800-Glossy-Carbon-Variable-Tone-2016.pdf for the black and white inkset I use. (It's not just for glossy paper.) A footnote at the bottom of page 1 gets you to the profiles. They include Arches profiles. That will allow you to see the ink loads and profiling strategy I use. Keep in mind what inks are in what positions when you read the profile information.
Note that I have not tried to make a profile with the latest Epson inks. If I were to try, however, one thing I'd test is not only what the latest Epson MK can do in terms of dmax -- using QTR and an inkload of 100% for MK. I'd also test what putting a bit of cyan into the 100% black does. In the past, I was able to jack up MK dmax with a bit of cyan. Good luck, and let us know what you find.
Another hint, try the back side of Arches 140. It has fewer "hairs" on it that might pop up and cause a white spot.
Paul
www.PaulRoark.com