I think if you want to soften your ride you may want to try Trim Tabs or a Hydrofoil .
Good Luck JT
Found this about props.
A 4 blade propeller has more blade area than a 3.
This increased blade area will provide better maneuverability on the low end.
A 4 blade propeller will generally handle weight variations less noticeably than a 3.
A 4 blade propeller will generally come "out of the hole" better.
A 4 blade will run harmonically quieter than a 3.
Because of the extra drag caused by the 4th blade, a 4 bladed propeller will be slower on the top end than a 3.
A four blade propeller will have to be smaller in diameter, pitch, or cup to achieve same rpm's as a 3 blade.