Yes, I would go back there.

Proper dyno dynamics setup, so should be fairly repeatable.

Technically I beleive the equation they use for the temperature correction was probably slightly out of bounds at 8/9 degrees as I beleive its not designed for use below 15 degrees (thats how the DIN standards tend to work anyway, based on 15-35 degree inlet temps), but we are only talking about tiny inaccuracies from that, and realistically its probably going to be the same sort of temps at the moment anyway.

Go for it

And when you do, ask for a full set of printouts, they should do you one with boost, one with afr, etc