you just have to remove the trim tab, cut the fin, then put in place again.
It has no effect on the torque because when the boat is flying at speed, the tab is out of the water, the prop has 2 blades submerged, but not the top one.
Attached 2 pictures of Aquarius, they are equivalent to your Ceasar, those run very fast - the white one has a 850cc Yam giving well above 120hp and goes 122kmh, the red one has a 50 Tohatsu.
The white cat has the engine set very high, the picture lets see the cone of the leg, its center is at water level, and it has a nose cone because the water pick-up holes are too high to be efficient.
I don't know the prop installed on your engine, but if you needed one, I have a 17" and a 19" both SS available