I installed a pair of these on my 2530 a couple years ago.
I ran the 16x20s for a while and they worked pretty good and now I run a set of 16x19 PowerTech 4 blades. I like the 4 blades better.
I would be interested to know if you experience a harmonic vibration with these motors.
The howl in the cabin of my boat while running would actually hurt your ears.
Mine was pretty bad at 4000 RPM and above (the reason I switch props trying to help it).
After quite a bit of time in the shop trying different things to get it better we now have it quite a bit better.
If you run into the same type of issue I would be more than happy to let you know what we did to make things better.
Good luck