Well im only going by what the graph says, was done at the rolling road day at Awesome gti in april 08, maybe im misreading the graph, anyone check it out and let me know.??
http://www.awesome-gti.co.uk/rollingroad/rr.gti_050408.html
Mine is the Vr at the bottom of the page, even a video to! 
Ahh...Awesome's Dyno...that explains a lot.
Lottery numbers I'm afraid...both on power and power at the wheels.
A Mk3 O2A will loose at least 30 BHP even on an optimistic Dyno...I loose 40-45 easily on every Dyno I've ever used (MAHA, Dyno Dynamics, Sun)
You are reading the graph correctly...but the read-outs are pointless except to see who's numbers are biggest on the day.
Where are the measured variables? Ambient temperature? Barometric Pressure?
Where are the coastdown losses?
You have a chart with good numbers...but totally uncomparable to any other dyno sadly.
A good 2.8 VR6 (slightly tweaked) will make 180-190 BHP with about 150-155 ATW, in my experience, on a reliable dyno.
My car made 151 BHP standard...Lupo GTI made 125 BHP standard, S3 208 BHP standard...my GTI now makes 196 BHP on the same dyno, with about 150 BHP of it actually at the wheels.