User Error
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When it was new it should have been set up for wot in the 4600 to 4800 range, and 4800 would be the max you should ever run it and that really for a short period of time. Now I have to ask, you are trimming up once you get on plane and trim down when you take off. With the prop you say you are running and the original prop you say you have that you can try, 21 pitch should bring rpm even lower, the 17 pitch should have you at the top of the rpm range if not over at wot. I'm thinking that maybe you are not trimming up and the bow is still in the water which would kill your wot rpm and mph to about where you are.
I just looked at your previous post list and see that you are a new boater with first boat so I am going to say look at your shift lever and there is a small switch that trims the drive all the way down then the first click trims up and on its second click brings the drive to the trailer position. You need to play with that switch and you can do that on the trailer just make sure you have ground clearance for the drive to come all the way down. Lower the drive all the way, then ease the switch up and the drive will start to raise then quit, this should be max trim, then move the switch further up and it should raise to trailer position. Get a feel for this, I think maybe you have not been using it correctly when on the water, start with the trim all the way down, once on plane trim up a little at a time as you do the speed will increase a little at a time until you reach the best trim setting, it won't go any faster if you trim further, may start to porpoise, when that happens trim back down slightly, with a little trial and error you will figure out the best setting. Also how heavy are you loading the boat, that does make a difference also be sure the engine is performing properly, but it sounds to me like trim may help you a lot, then get the Smart Tabs.
Thats with trimming it out... I start with it all the way down once on plane i'll pull it back up till I find the sweet spot... as far as load I had cooler on board with a Large bag of ice a dozen bottles of water and a gallon of tea, and about 700lbs of people... 4 adults... we were just out for a cruise so no real gear... had life jackets thats about it... I put the 21 pitch Alum stock prop back on today... Thinking I'm going to head out for a 30 minute cruise to see how it does... but I guess I should bring the 17 pitch with me so I can run both same day with the same load and see how they work out... The 17 SS was a Quiksilver that I pulled off, I've also got a SS 17 pitch michagan the boat came with... and the 21 Alum stock...
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