I didn't mean to dictate to you how to run your print business, but it is important, IMHO, to be up front with customers. We don't operate on an island nor in a bubble and it is hard enough to make print sales a viable endeavor without creating additional obstacles for ourselves.
As far as Exhibition Fiber it is a great paper and I don't doubt you are getting great prints with your 1430. The reason Epson is telling you that it is not compatible with your printer is because Epson designs their papers for specific ink sets. The receptor layers on their papers are specifically made to work best with either dye inks or pigment inks. In many cases their papers will work with both but in some instances, such as EF the swellable polymer coating works in conjuction with the make up of the pigment inks. Using dye inks may cause a situation where the ink does not dry thoroughly. If you frame a print behind glass that is not and possibly cannot dry completely it will fog the glass due to out gassing.
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