Alex.
Going back to our posts about static RPM on 13th May I flew yesterday and rejected the takeoff when the RPM was much less than it should have been. Static should have been at least 2350 but was only 1900.
Fixed prop, shortish runway, no room for messing around on the climbout etc.
Rejected takeoff, the plugs pulled out and cleaned, back in and it was fine...after a very thorough run up with me and the engineer.
This is why you should do those final checks as you are rolling.
RPM
T&Ps
Airspeed
Have fun!
G