I have yet to see anyone on the forum get to that level of detail. I suspect unless someone is skilled in CFD analysis or has the time and money to test out these details we'll never really know if doing something like this really helps or hurts performance. These details get real complicated to explain and understand and their impacts on performance are small compared to the main upgrades. Jim Selin might have a better feel for this.
In general I would agree with xteam300tt and kkrofft that polishing helps.