Prop question

[MechanicMike]

I bought a used boat at the end of last seaon. Its a 1999 Grady White 209 escape with a fuel injected Saltwater Series II 150. The prop was real worn, like to the point you could shave with the blades. I ran the boat with the old prop a few times. Cruise RPM was 4300, it would run about 26-27 mph (GPS) depending on conditions. Wide open it would go about 5400 rpm and in the 33-34 mph depending on conditions. In the off season I replaced the prop with a brand new replacement from Yamaha, same size, pitch, material etc. Put the boat in the water yesterday and took it for a cruise. The boat seemed to cruise at 3900 RPM at like 28 mph and WOT I couldn't get any more than 4400 RPM and 30 mph. I didn't keep it WOT too long because the conditions were getting snotty and winds were picking up a bit. I also noticed a slight vibration around 5-7 mph and 1500-2000RPM in gear. Seemed to go away on acceleration and at cruise speed.

Is this normal for a new prop? Engine seemed to run fine, so miss, or hesitation at speed. I'm kinda new to boating so any info would be much appreciated.

Thanks Mike

[rodbolt17]

no
either the old prop was way wore out or your fuel system plugged over the off season.
best way to find out is a quick run using YB-1626.
if it cannot spin test wheel YB-1626 to 4600-4800 its broke.
if it can you have prop or hull issues.
yes its that quick and easy.

[MechanicMike]

Thankyou sir for the reply. I'll try to get my hands on a test prop and go from there. If I can't are these test props available for purchase? I also ordered a shop manual for this engine.

Mike