You said this power was at the wheels? you would be looking at 40/50hp additional for flywheel figures...
A decent tune on an AGU in decent condition nets 190 ish hp tops at the flywheel...
What boost? what fuel are you using? was it logged to see if there was timing pull?
No idea who this 'perfect power' lot are so couldn't comment on their mapping abilities... you need to take into account the state of the engine, turbo and pipework etc... no mention of this...
Before chasing more power you need to make sure the engine etc is in the best condition as power drops off dramatically if anything is not quite right...
On AGU's its even been known for throttle cable stretch to be a factor and not even be getting full throttle with the pedal planted...
Scan for faults, do some logging and check for split pipes etc... if the 'dino' you took it too is not a specialist in VAG (and sometimes even if they are!) they might not have even checked any of this and ran the car as is...
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