I personally think a 21" prop will be your best bet. You might could stretch it to a 23 depending on prop type or work a 21/23 to a 22. Prop type will play a big factor. For reference, I have been playing with my set up on and off for the last 2 months. I have a 23.5' Fishmaster about the same weight as your 2200 Nautic Star (2100- dry). I have a 250 EFI Merc. I tried a 23 and it ran great, but couldn't get close to max RPM's. I tried a 19" 4 blade, but wasn't happy. I am now using a 21" Merc prop that is known for good bow lift. Right out of the box, I got 41 @ 4000 and 57 @ WOT/5800rpm's. I sent it off to a prop guy that I've used before. I gave him my numbers and my performance desires. Everybody is different with preferences of hole shot vs mid range vs top end vs bow lift vs stearn lift, etc. He did what they call bue printed the prop. He adjusted it for my desires and balanced it. The same 2 props out of the box can act very differently. I haven't run it yet, but I fully expect to gain 2-4 mph out of mid-range and top the 60 mark at wot. I would think you should expect about the same - 40-44mph at 4000 rpm's and 56-60 at wot without any loss to hole shot.
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