Kevin, When I had my I/O 18' I had a fat sac in the ski locker and a sand bag under the front seat in the bow and bench seat in the back. The sand bags were at least 50lbs. ea. With that-4-5 people, gear coolers, etc. we would run about 19-20 and trim it up as hi as we could before porpoising the bow. I did not have fins on the outdirve but that may have helped. I also only ran a 3 blade prop. From my experience, the wake on your boat will be spread apart and there is not a whole lot you can do about it. Faster speeds = narrow smaller wake slow speed = bigger wider wake, you just have to find a happy medium.
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