Some units provide a "dialog lift" function that some listeners find is helpful. If you have individual channel equalizer settings, emphasize the vocal range for the center channel and boost its level.

Since your ears are not "flat", don't worry about "flat" settings on the equipment.

You may find that there are several optimal settings, depending on the channel and content. Setting this on a per channel or per program basis will be messy, but I know that you can deal with mess.