When I export my file to EPS, I usually check how it exported by importing it back into CorelDraw. When I do, all objects appear to come back in grouped together on one layer, named Layer 1. This is despite my original file having more than one layer, each of which has been re-named. There has to be a way to do this, doesn't there? I just don't see any such options in the EPS export dialogue, though. Or am I missing something really obvious?
Coreldraw creates an Adobe conforming export EPS for output not for editing. EPS files that maintain layers are non Adobe conforming EPS file created by Illustrator and Photoshop. That's my understanding of it years ago.
Now a solution may reside in how you expect your exported file to be used, if it's as editable in Adobe products the ability for Adobe to edit them will be limited.