Going down a couple of inches in pitch will get you to the higher end of
your WOT RPM and should help out the top end a bit. Like I said something
else is keeping the speed down. Have you checked it with a GPS? It's
possible that you're going faster than the speedo shows.

"A bit" doesn't sound like much. ;-)

GPS verified speed as near accurate (actually slower than what was reported on
the speedo, but considering the tide -- that would be expected)

Any ideas on what could keep the speed down by 10mph?

The original "Matched Options" book has this listed:

High Performance Propellers
V-6, 3.8, 4.3 Litre "1980 thru" OMC Racker14.5x24 = 50-60mph!

Whole cow; that's fast batman

But up 5" in pitch? yikes; that certainly would bog down & overwork the engine.

The prop does have a few dings in the end.

A trial today with glass like water got me to 35mph @ 4600 rpm; so maybe I will
go up in pitch


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