Karsten,
You should not use the Epson preview window to judge color. (This is noted in the Epson manual and Epson online help.) It should only be used to judge page layout (i.e., if your image is centered properly on the page, oriented correctly, etc.). Again, in summary, ignore the colors/tones you see in the Epson preview window, regardless of what your driver settings are.
Second, if you are asking Photoshop to let the Printer Determine Colors, then it doesn't matter what your rendering intent settings are in the Photoshop Print With Preview box. It will be ignored.