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Hi fellow Chaparral owners. I have recently acquired a signature 240 fitted with the 5.0 Efi Mercruiser (240hp and only 600 hrs with Bravo 3 leg). She is a beautiful boat but really struggles to get on the plane. Had her fully antifouled and load is usually only 2 (lightish) people, 10 gals water and 30 gallons fuel plus luggage as we live aboard occasionally. At best had 25mph (following sea and wind) but usually about 10 mph because she will just not get up! Changed the 24p prop for a high tech s/s 4 blade 20p with negligible difference. 4000 rpm is about best we can achieve. Engine sounds s