2000 Volvo high fuel pressure

HI everyone new to the forum, im having some problems with my truck. Im losing power in high gears blowing white smoke engine has 974K. 56k after overhaul . took it to inland power group dyno showed 280hp at 26psi ecm is programed to 500hp. They told me my fuel pressure was to high 60psi idle 68psi no load I changed the fuel fitting behind the head and runs a little better but still loss of power whit smoke and the fuel pump has been changed.

 

I had the injectors replaced when the overhaul was done. They even check them electronically . Do you think they could have gone bad ?? Should I have them bench marked tested????

 

The shop said 60psi at idle way to high should be 30psi that's why white smoke etc etc

 

Don't think its a bad sensor I forgot to to say that I have a 2000 Volvo with a detriot s60 motor fuel injectors where replaced when over haul was done .