[Inyourface]

Hi Andy,
Are you printing from photoshop. If so have you proofed them. Also are you using genuine inks. What paper are you using to print them and have you tried other types. Have you got both the printer and photoshop colour managements on (then select one or the other, do not have both on at the same time, you will have odd results like you have). Have you tried a custom curves adjustment as epson cartridges can spill out to much ink (especially black)and you may have to adjust for the cast.

Its nothing to do with your screen calibration as that's a viewing aid. its down to the printer or maybe the paper.

If you have done all of the above and have one of the colour managements (not both, preferably photoshops))turned on then do a test sheet ( make a load of small images to fit on A4) do a custom curves using each channel for each layer (check your RGB at first it to see if that could of been the problem in the first place) and then print and check the colour to see which one improved and if you find the one of the test samples has worked then save the adjustment for that layer for future prints. If you find the colour cast on one of the samples look better but not 100% then repeat the test sheet again with further adjustments.