As for suggestions of specific propellers, I recommend you test some Evinrude REBEL propellers. The REBEL propeller is the most FUEL EFFICIENT propeller that I have tested. The classic three-blade design gives very good all-round performance, fuel economy, and speeds.
The Evinrude REBEL TBX propeller uses a universal hub and bushing design called the TBX bushing. I have compared the TBX hub and bushing design to other choices and found it offers more positive connection between propeller shaft, bushing, hub, and propeller than other designs due to the longer length of the contact area.
Here is a look at the TBX bushing design (shown with a four-blade CYCLONE propeller):
Note the long metal coupling between the propeller shaft and the bushing; the length of this component is much longer than on other brands which offer similar universal systems.
The Evinrude interchangeable TBX hub kit is designed to also fit Mercury, Yamaha, Honda, and Suzuki V6 outboard engines. For example, for Suzuki you would use the following components:
128775 Thrust Washer (stock part for all)
128752 Torsion Bushing (stock part for all)
177289 Bushing Sleeve (stock part for all)
128765 Spacer (specifically for Suzuki)
For the propeller nut you will use the one supplied with your Suzuki engines. You can order all the parts under one part number, 177288. The kit has all the parts for any Mercury, Yamaha, Honda, and Suzuki V6 outboard engines to use a TBX propeller from Evinrude.
The REBEL TBX propeller is available in pitches of 15, 17, 18, 19, 20, 21, 22, 23, and 25, and in both right-hand and left-hand rotation. (Here I assume you will get counter-rotating twin engines.) You can really dial-in the right pitch when working with a propeller line that has pitch increments of 1-inch.
If you really want a four-blade, try the Evinrude CYCLONE four-blade. I have also tested that propeller. The CYCLONE TBX propeller is available in pitches of 15, 17, 18, 19, 20, 21, and 23, and in both right-hand and left-hand rotation.
EVINRUDE has published a really good booklet that explains propellers and how to select them. It is free and can be downloaded from:
http://www.operatorsguides.brp.com/OperatorsGuidesAttachments/OwnersManuals_EJ/attach/Accessories%5C766315%20EN.pdfI think you will find this Evinrude publication has a lot of good information about propellers.
For more about the REBEL Propeller, see:
http://continuouswave.com/ubb/Forum4/HTML/004368.htmlFor some first-hand test data from my own testing of the REBEL and CYCLONE propellers, see
REVENGE 22 W-T WD with 225-HP, Three Propellershttp://continuouswave.com/ubb/Forum4/HTML/006964.html