Mark1234
My final comment.
When I am flying an aircraft with a CP prop and on application of full throttle the engine smoothly accelerates and I note that it is indicating close to field baro MP (or redline MP for a turbocharged engine), full redline RPM, full redline fuel flow (for fuel injected engines) and all other engine guages have normal indications I will be satisfied that it is almost certainly delivering full power and I will now concentate on controlling the aircraft.
You seem to be convinced that the above check does not assure you of full power on takeoff. I guess it is up to you to do what ever you feel necessary as the PIC and therefore I have nothing usefull to furhter contribute to this issue