I have a 1992 FourWinns Horizon 190, OMC 5.0. Everything (but a $1200 gearset) is 100% stock. I have been running a 3 blade 14.5 x 19 since, well, since 1992. Most recent prop is a "Michigan", I think from Overtons. Never had a problem. I top out right at about 50 +/- based on water, fuel level, etc. Sounds like you just have the wrong prop on there.
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