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I have a 75 HP Yamaha 4-stroke on a 170 DC and it runs great. I did readjust the motor mount according to Yamaha's recommendations and I do have a "Dole-fin". The fin really helps to get up on plane quick, but I still had no problems like you describe even without the fin. I'd reposition the motor before I'd invest in trim tabs or such. You shouldn't need trim tabs on that small a boat.
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