Hello, sorry for bringing this thread back to life.
I hope this helps someone.
The settings I use on Inkscape for the EPS are these:
"Restrict to PS Level: PostScript Level 3
Output page size: Use document's page size
Bleed/margin : 0.0
Never use halos, gradients etc. The image has to be solid, no opacity less than 100%.
Never mix vectors with bitmaps in the same image (PNGs, JPGs etc).
Avoid using fonts.