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haha, i had trout on the lakes in my mind.
still the same rules apply for the prop set up, but for a high speed trawl i would think the 17 with a higher rpm would give you better torque and it will...

yep the best prop is the one that runs out at wide open throttle in the correct revs.
depending on the motor it may be 5400 to 6000
look up the specs for your motor and see.
then, take both...