Anorax wrote:vocals are almost always panned to the center of a song anyway, an exception being double-tracked vocals)
Or possibly background vocals. But I suspect based on my interpretation of what the OP described, this is not an issue. But then the description of efforts at "widening" concerned me.
Vocal, Mono, centered. For now.
Also add, close miced, reasonable levels, quiet space, minimal natural room reflections.......