I have been polishing my props using auto polish for some years on other RC aircraft and I do notice a marginally smoother flight.
The smoother the flow of air with less disruption over the aerofoil surface, improves velocity and subsequent lift (thrust). That is why aircraft wings / props are constantly cleaned to maintain efficiency. I noticed one reply suggested they preferred grippier props, this is drag, something you really won't to eliminate from the aerofoil surface. Drag disturbs airflow and reduces lift / thrust...not good. I have also polished my Vision props, just occasionally, gives me constant flight times (18mins+) and slightly smoother video footage. It also means that bugs / insects don't stick to the prop during a mission. Give it a try...I think it's one of those 'one' percenters that works.