Alan,

I have had this discussions many times.  Check out the Reno race results for
the last two years.  Pay particular attention to Dave Morss's times.  He
used an MT propeller for all of the racing except the last day.  There is 10
mph difference in his average speeds when he used Lancair's Hartzell
propeller off of N199L.

There is no better propeller for the engine no matter what the weight
advantage.

Regards,

Timothy Ong