The buzz-saw effect has little to do with centrifugal force causing enhanced bullet expansion. You ever spin on a tire swing as a kid? Remember how the faster you spin, the more the universe tried to throw you out of the swing? The same thing happens with bullets; the faster they spin, the more force there is trying to throw the ruptured nose of the bullet outward as expansion initiates.
RPM's definitely contribute to bullet expansion, and simulated low impact velocity tests do NOT replicate actual bullet impacts at long range, even though impact velocity may be similar.
