EcamSurprise
Sounds good to me..
Run an IFLD, consider the runway and met conditions and using company suppled data (e.g. QRH) see if you can find and if so use an autobrake setting that brings you to a halt in no more than two thirds of the runway length....job done.
Do anything else and you are just guessing and in the worse case what you have done might not stand up to scrutiny at a subsequent board of inquiry.