Johnny - use the Canon DPP which came with your 400D for printing (if not v3.2, see DPP thread in digital dark room for upgrading info), it is one of its best features.

In the preferences, find and check both the printer and the paper you are using. Using command D, not P, for full preview, sizing and position on page. In the subsequent pre-print dialogue box which should include all the Epson options, go to colour management and check 'no colour adjustment'.

I have antique Epson 1290, but should not be much difference. To make really sure, use the sizing facility to do upto 3 mini-prints across the top of a sheet of the correct paper (offcuts from squares!) & fine tune the colour cast using the DPP preferably 'colour tone' &/or white balance on RAW file, hue in RGB if too late. NB no need to convert from RAW, print from the real thing & in the white balance box is a full colour wheel filter option, though can just be used as blue-yellow slide.

DPP will also store both the colour-adjusted-for-print version and the original in the one file.