Temp changes have little to no effect on fuel trims. The maf is pretty smart.
"Tuning your maf" to work in the system that is closed loop using a narrowband... is really just a play on words. As much as you would like to think you are "tuning" your car, you are really just playing games with the narrowband sensor. Any time you are in closed loop, the narrowband sensor is the boss of everything fueling related going on, so any tuning done with the narrowband out, is a complete waste of time. Also trying to tune the narrowband with a wideband is also flawed, as it will always read differently (due to MANY reasons) than a narrowband will.
