My understanding is that she should turn up to 2600.
True if you wish to cruise at or near 2600RPM.
Sounds like a knowledgable owner installed a cruising prop on your boat , and the results are good.
Why would you want to re prop to gain 300 or 500 RPM at cruise at the same speed and burn more fuel?
Simply install a RED line at 1650 and do not cruise over that RPM.
If you are a "belt and suspenders" guy install an EGT gauge (about $120) and cruise efficiently as few other trawlers do.
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