Bacardi
I'm not so sure that would improve anything.... other than tie up two cables instead of one.
I've done something along those lines by using the HDMI for video only, and the coax for sound. the diff was so marginal as to not be a concern... and it tied up two cables. The coax being a very expensive one.
the notion I got on the 93 & 95's twin HDMI outs is for use in separate zones, or as separate incidents, or just differing displays.
Of course, who knows... maybe twin HDMI cables can help. I'd simply bet aginst it... all things being equal.