Wanted to add my experience here

Boat Info: 1986 Supra Saltare, 22' open bow

Drivetrain Info: 454ci/330hp PCM 1:1 direct drive 1200+ hours

Prop Specs: ACME 209 4 Blade 13" x 12.5" 0.080 cup

Performance / Usage:
WOT unloaded: 4500RPM at 37.5MPH (ridesteady digital readout, GPS)
11.2MPH at ~2600RPM with ~1900lb ballast and wake sharper for surfing. Seems like it's working pretty hard, nearly not doable with more than 3 extra bodies onboard. No chance in the world of getting on plane with that weight.

Seems to cruise pretty happily unloaded at 2600RPM at 25-26MPH. Fuel consumption makes it seem like it's not in the secondaries of the carb, therefore fairly economical.

Switching to Acme 1229 (13x11 80 cup) this week to help ease load on the aging old girl while surfing. Hopefully I can avoid letting her spin too many R's when unloaded.