I really think it comes down to what speed the mixture is flowing through the transfer ports.
Aerodynamics in subsonic vs supersonic are quite different...
The best way to get through subsonic air is with a round shape like the leading edge of a passenger airplane or the shape of most parts on a formula 1 car (smooth flowing transitions).
The best way to get through supersonic air is to cleave through (knife edge) like the wings on the X-15 or most any modern supersonic fighter-jet.
Until we know weather or not the flow going through the ports reaches supersonic speeds you can not say for sure. Might seem crazy that the gasses flowing through your motor could be traveling that fast but in motogp and F1 racing intake speeds reach speeds that high.