Patterning is a gun vs. gun thing, or a choke vs. choke thing. Lots of different factors play here.
More pellets are more pellets, pure and simple.
If there is anything on the line, whether that be money, a ham, a standing rib roast, etc, etc I will use everything possible that is within the rules of the game.
If 1 1/8th is the maximum load of pellets, which it usually is, that is what I will use.
I would be willing to bet a dozen doughnut holes that those that shoot at the highest levels are using 1 1/8th oz. loads.
I could be wrong, but I would bet those dozen doughnut holes.