Printer Color Management in Illustrator vs Photoshop (Epson/Windows)

I have an ET-8550, a very good printer.
I have given up on printing from Illustrator and downloaded Epson Print Layout. It can be set as a Photoshop plug-in. Save the Illustrator file as a PSD for Photoshop and print there.
You can also load TIFF and JPG directly in Epson Print Layout not PSD, but fine from PS. Color management for the ET-8550 is RGB. There you can use profiles or let the printer decide; the latter you can choose if the file is sRGB or AdobeRGB. And it uses, of course, the proper paper profile.

So to have a workflow with AdobeRGB as the color space is fine. 

Yes.  The Epson print drivers will interpret your Illustrator settings.  I wonder if a little experimenting would be beneficial.  That could be setting up documents for each app that are identical.  Print them ( maybe you already did ) and see if they are similar or way off.

I am also having the same issue. It does get a little confusing trying to get all the color management settings correct. It might be best to export and then print? I don't think the 8550 is a post script printer, and that might be the issue. 

Did you ever figure out the issue? I just got a new Windows 11 laptop and I'm now having the same issue with my Epson ET-15000.