I've been reading, "googling", asking about the props for my SR357 and not really making much progess but did pull-off an experiment this weekend that provided some interesting data.

Boat is a Formula SR357 with MarinePower efi 454's. THe drives are TRS's that are on 33 1/2 centers and the prop shafts are 9 1/2 inches below the bottom. Props turn out.

I've been running 21P Mirages and could only spin 4000RPM at WOT.

I had a pai or TRS Cleavers and couldnt get any definitive info about them so I lashed them on the boat this weekend.

Couple of obervations--

Picked up 200-300 RPM at WOT
Picked up a few MPH at typicle cruise RPM (3000)
Needed mor throttle to get opn plane
Props would cavitate on hard acceleration and on hard turns
I think the boat was riding lower in stern because with the trim planes down I had great rooster tails on both sides.
TRS manual suggested 14 3/4 221P cleavers or 15" 19P mirage "like" props. (Since manual is from 1986 U said Mirage like)

Food for thought at least--

Actually your stern was riding higher and this is why you had a rooster tail, had a more difficult time getting on plane and picked up some RPM.

Julie