1165 fps isn't very fast, but dropping the load from one ounce to 3/4 oz is a 25% reduction in mass. The force to get an ounce up to speed will be reduced significantly having to only get 3/4 ounce up to speed. Remember when they told you in physics class that for every action, there is an equal and opposite reaction?

I remember physics class. 1 oz at 1165 is easy peasy. Try 1 1/2+ at 1200 + in an 8 bore. That’ll put manners on recoil-sensitive shooters.

I cannot get used to those very "light for gauge" loads. Too many years of shooting "standard" loads leave me expecting some recoil from the shot. It's disconcerting, and distracting, to me when it's not there. I will shoot 1 oz. loads in a 12, but don't go below that unless I go down a gauge, or more.