a 14 to 15” diameter with a 20 to 21” pitch would be about right for a df150 with the 2.5:1 gear ratio. However it is way too much prop with the 2:1 gear ratio.
The Suzuki web page indicates 17 or 19” pitch with the df150 version with the 2:1 ratio.
You should not settle for RPM in the mid 5000 RPM range or your motor will under perform. You should not settle for a set up that delivers any less than 6000 RPM at WOT.
However, since it is appears you have not set the motor height correctly you are wasting your time and money investing in another prop. You boat is underperforming and there is no alternative but go through the steps to fix it.
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