Thanks for the feedback, JSWolf, but we'll be leaving it as-is. The goal is for the publisher's name to be readable when the book cover appears as a thumbnail when viewed on various ebook retailer sites (Amazon, Kobo, etc.). We've been publishing the Oz books, and have acquired a following for well-formatted, illustrated books. Our Oz book covers are all similar, with "Eltanin Publishing" across the bottom. When people see our name on the thumbnail cover, they know they're getting quality work.
Of course, for non-public domain books, it would be silly to have the publisher's name on the cover. But when readers search for classics, they get many options; there has to be a visible way to tell them apart.