If there is no major head height and distance involved in the set up, perhaps...
to be honest I cant say as my banker has a different trap method.
But, more pitch can mean less water needed, and flatter more water in some cases.
I adjust mine either way after a few shovels, and have a look, caking/ clogging, drop the angle or up the revs, stripping it empty to much back the revs or angle down.
But if im putting dry hard dirt in the hopper, I like to have jets going hard to break it up quicker, so I increase the revs and drop the angle a bit. Creek gravel wet is generally easily stripped clean, thus I dont need a lot of water pressure.
I do beleive the flow waves should look more even across them but.