I agree there, but if the tuner doesn't know what to expect, and is just told tune my car to make as much power as it can.;
If the car isnt missing/fartig/eaning out etc, then there isnt an issue in the tuners eyes.
We dont know the full story as you say.
But if I were tuning it (im not a tuner btw) and the car had consistent boost drop on every run on the rollers, than I would assume that's just how it is. I would ring however and say boost is dropping off is that normal, but its not like the car would hold boost for one run, drop off the next and then spike all over the place on the run after.
If it was doing that then all "good" tuners would shut it down, ring the bloke and say its not tunable.
Many cars drop boost in the top end, my Soarer does due to the Standard dump/front pipe being hugely restrictive
Aaron, half assed work is what keeps some of these less professional guys in business, because they dont have the skills to do everything 100% and quickly, so they have a near enough is good enough attitude which sucks