Basic problem is you are under powered... you can patch / fix by going to higher pitches.. but end of the day u are just loading up the engine....right thev way thru its rpm range.
Not good for any engine , be it a car truck tractor chainsaw.
You NEED min of 15 to 20% reserve power... IE the power required to move the boat at a given speed / rpms on flat water is less than the potential power of the engine.
Some ppl dont understand this concept or Im bad at explaining it.
So take say a V8 muscle car... it cruises at 60 mph @ say 2500 rpms top gear. It will require about 25/ 30 hp to do so. At woT at 2500 rpms there is capability / potential for 90 to 130 hp...
So when the car comes to very steep hill a very slight adjustment to the throttle and goes up with no change in speed or rpms.
So back to the boat.. if under/ min powered then there is nil room to get up the hill .. unless get more power to the prop.. that means more throttle... higher rpms// loaded up even more, exploate the logical out.. the back wheels loose grip and slip, heaps throttle , pouring fuel in , no economy.
Bottom line...min powered , under powered.. you are at full power at a given rpms/ speed...sliglest 'hill' (chop wake etc) the rear end slips, loose grip, momentum and the bow goes up, slows down , basically crap ride, triming..
I have to agree with the others above, again, your pitch is about right... for cruise, assuming the engine height and have established the best trim height at cruise (in your case unfortunately fixed trim) to fine tune a little, a prop with a little more grip...diameter, cupping.. even rake, or smaller diameter 4 blades would improve things..slightly.....patch a bad situation
BUT not FIX.
Sry if sounds a little blunt...
FIX.. re-power + variable trim...the difference in handling chops , economy, cruise... EVERYTHING.. you will not even closely recognise as the same boat....
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