Hi Roy, I put a similar question not long ago, I have the same prob with my epson cx3600 and epson r300 could not get rid of PURPLE cast! did everything you have, had it checked at a epson drop in centre (they scanned a mouse mat and compared with original) the cx is a 3 in one the scan was ok, so I think it is a compatabiliy problem with my computer I sent the £90.00) r300 back, and bought a hp desk jet from ebay for £9.50 and it is fine!! I still have the prob on the cx but it is for office use and I do my bird prints on the deskjet!! ps tried epson carts and others and it made no difference. sorry I could not help, but I gave up in the end as I could find no answer (including epson)
regrads
John