I haven’t verified this tip yet, but Charles Staley once said that you can lift more weight if you look at your dominant hand when benching. Although you are not supposed to turn your head at all.
Really, I have no idea if this works, but if you give it a try please let us know what happens. It doesn’t sound like anything I would ever tell anyone to do, but maybe it has a place in max effort training?
I remain skeptical.