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TAMD31P and lost revs & power

I have bought a 2003 model boat with Volvo TAMD31P engine. The engine has 630 runnning hours. I know from many sources, even from the first owner (I am no. 3) that this boat should make 21 knots and some 4000-4100 rpm. Now it makes only 3600 rpm and 16 knots max. The bottom has just been painted, propeller inspected and is OK, fuel filters have been changed, I have checked the fuel tank and the intake and they look visually clear. There is no smoke coming from the engine and otherwise the engine runs normal.
Fuel economy I haven´t have chance to measure, but I assume that now the revs are out of the economical range.

I would appreciate if someone could share your experience or have explanation/ideas how to solve this problem. The lost revs and power is needed badly. Thanks in advance.
 
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