Yep if your is in good running order ,your prop is a dud.
I have a a Old 1988 201 Pro with a 2.5 200 carb with a load and can run all day long @ 65 GPS with a Bravo 1 24 pitch prop at 3. 50 below pad .
I run the old school Bravo1 with holes drill in it and it still has the the full flare . Which the boat runs flat .
I can run a 25 pitch Temest Plus and it will run around 68 GPS . But has a ton of bow lift and you will have to drive it as the chine walk , comes in around 66 GPS if you not on top of it.
I had a similar rig (2002 21XL) and ran a 27P Tempest Plus. I ran high 70's consistently, I am in a slower rig now... :(
I do still have 2 spares. One Brand new in the box and another that I only ran once. PM if you are interested.
2021 Skeeter ZXR-21 with 250 Yamaha SHO, Pro II Power Poles, Atlas Hydro Jack Plate