I have one of those,"DUAL RESPONSE" type sessions to do here at the keyboard. First of all, BILL ROBISON, I would like to round all of you," HIGH PRICED SKOTCH SNOBS" up someday and administer a blindfold test! It would be fun to see how well the palette can discriminate between the industrial swill, and the good stuff.
C WATKINS, I have seen NEANDERTHAL TECHNOLOGY applied to a FOX .36 COMBAT SPECIAL that was running the TF 8.5-6.5 pylon prop. Instead of grinding on the sidewalk, the local guru was using a pair of "dykes" to trim it to a length that would keep the motor happy through the high G manuevers. It worked well enough for the R&D session, and I have used the same technique myself.

that is a pretty funny [ and barbaric] way to find the winning combo, but in the service we would call it a, "field expediency". What looks ridiculous, but works very well is a 5-3 COX chopped down to 3 7/8" on a 1/2A C/L COMBAT plane. A VA will kick "A" with one of these $1 wonders.