Ranger Prop Question

[SL60]

Background
I have a 2021 Z521L with a Yamaha 250 SHO and a Atlas 12 inch Jack plate. My trolling motor batteries and electronic Batteries are Lithium...my starting battery is a gel Battery.
I currently can only get the boat up to 60 mph while my last Ranger 2018 L boat hit 68-70.
Here are the props I have tried so far
Fury 25 pitch prop....5200 RPM....60 MPH
Tempest 25 pitch Prop....4800 RPM 65 MPH
Tempest 23 pitch Prop....5800 RPM 60 MPH
I have available from friends the following props to try...23 and 24 pitch Fury and a Bravo 1 25 Pitch 4 blade prop.
So I don't just keep trying and changing props has anyone ran into this or have advice on the proper prop to get back to the 65-70 at 5800rpm?
Thanks
in advance

[Ranger519VS]

I have 2 props I run on my SHO and Z521. I have a 10" bobs jackplate and run ~3" ptp
24 pitch Fury 4...........5850.....68 mph
25T1 non vented.......5900......68-70 mph

Your boat acts as if it is down a cylinder.

[SL60]

Thank you ...checked not down a cylinder

[SL60]

Ran the boat today with several props. The Fury 23 Pitch ran at approx 6k rpm and 65MPH was the best from what we had. the tempest 23 was second best at 64 mph and just under 6k RPM. I hope this helps anybody else with the same question.