WhiteKnight,
This is a very valid question. I subscribe to the school of thought that you do not have to recalculate your performance. The changes that you provided in your calculation is possibly some form of optimisation and does not mean that your original calculation is invalid. I suggest you run the same calculation but hard tune the Flap 1+F in the configuration. I would be very surprised if it produces red numbers, or any changes at all.
You can put literally any temperature you like in the computer and it will produce the same result bar a very few circumstances where optimisation changes the configuration. The only difference is the performance limit weight whose only real value is of a cross check function with your colleague(or if it is limiting).
As long as OAT is below flex -1deg, you are good to go. At OAT = FLEX -1 you need TOGA and at OAT=FLEX you will be over the limit.