Bounceonland, sorry for the digression.
Turboprops set power by means of torque, right? And you have a table or chart of rated torque vs ambient temperature, right?
And if you look up your TOGW, PA, available runway etc. you can find the highest ambient temperature at which you can TO. Call this the flex temp.
Then go back to the power setting chart for that flex temp, and read the proper torque for that temp.
That's it in a nutshell.