I went through this almost to the letter on my 18 last year. My motor is a '92 Evinrude 120 hp and it was mounted in the top set of holes with the ventilation plate 1" below the bottom. It took forever to get on a plane with spray flying everywhere and in general was a dog. I raised it to the bottom set of holes which put the ventilation plate 1" above the bottom. I also put a cheap Apollo 4 blade prop on following advise given on this forum. The difference was really quite amazing! it hops right up on plane now, rpms are where they should be, spray is under control and minimum planing speed is down to around 15 mph. I think I could raise it one more hole but I'm out of adjustment. The boat really came alive with these changes and well worth having to play with the trim a bit more.
Rod
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The older I get the faster I was!
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