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Answers to these questions will help:

When you run the boat, how many people are usually on board?
How much gear/supplies? lb or kg?
Do you go in large waves or only calm?

What do your local dealers have available? Do they allow returns? You may need to test 2-3 sizes.

I would go with either Enertia or Vengence. Enertia cost more. The Enertia requires a slightly larger pitch than the Vengence. (17" in Vengence = 18" in Enertia)

As for the pitch, I would start with a 17 in the Vengence and an 18 in the Enertia.

You want to run the engine 2 holes up, top bolt in the 3rd hole down from the top.

Please report back rpm and speed at full throttle. Detail what the load was in the boat (people, fuel, gear).