[McGillicuddy]

Mike,
Congrats! Where the heck did you find a new 2005? Per the other thread, you boat looks great!
Not a prop god but have tried a few on a 20 w a 115.
Need more info. What brand and model prop? How high above the keel is your anti cavitation plate at level trim.
Are you achieving max rpms at WOT? That's the first step. 4600 rpm does not sound like WOT. But 30 mph at 4600 ain't bad. If thats all you're getting you need to check motor height and prop ID. If you are running an aluminum Yamaha semi-cleaver, I think you can do better.

I think the 20 with a 115 really runs best with a 15 pitch. The exception would be an etec 115 that probably has the balls to get a 17p up to speed. I actually gained top end by dropping in pitch because the motor found its sweet spot.

That said if you regularly fish skinny water you might be able to raise your motor and that will gain you rpm thus more pitch is possible.

I keep preachin' the same thing: the Merc Black Max/Quicksilver Black Diamond are tremendous stern lifters that are easy to turn and grip pretty well. 13-3/4 x 15 p. More blade area less cup and rake than a "hot prop." Out of the hole instantly. All of these props are avilable with a insert-able hub so testing is fairly cheap and simplified.

If you're fishing inshore near structure I see no reason to go stainless. If you do choose ss, Power Tech has a MQF series that is the same shape and will perform like a champ. Between 30 to 40 mph I don't think you'll find a better over all prop shape.PT Props also has a 4 blade semicleaver "SCD" that mimics the Yammie shape, could prove be very economical as well as offering great hole-shot, grip and top end. These props (shape) are designed for stern heavy rigs under 50 mph. Many props simply excel at higher speeds. If you had a 150 etec you could look to more aggressive cups and rakes.

Powertech Props has some nice info viddys that teach about prop selection.