Your probably right and that would be the easy answer.pretty close on poi. I wouldn't sweat it
I'll put a piece of tape on target horizontal with a level the shoot a group pulling extra hard into wall then I'll shoot three more arrows creeped forward.if on same plane all is good but if an inch or two difference vertical wise between groups I'll add or remove a twist then repeat till it's gone.then I can always restring my bow to real close perfect cam starting rotation.i think you can tiller tune and have similar results but haven't played with that to much.
I bought a bow press and spent way way to many late night shooting in my basement and tweaking bow string to shoot four blade broadheads with field points and bareshaft tuning and on and on.setting 3rd axis on sight.uhhgg I'm way to OCD but dang it's fun sometimes then again it tends to make work out of something that don't make a hill of beans