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The ideal pitch will depend on what propeller model you want to use and that could depend itself on several factors. There is far more to propeller selection than just pitch and diameter.
Tell us what propellers you use now (size, model, part number) and what top speed you see at WOT.
Also, what is the RPM at WOT?
How high are the motors mounted on the transom? In other word, what hole set is used to bolt the motors to the transom?