I've always been DEEPLY skeptical of AMD's dyno plots... I've had 4 dyno runs there, with 2 different cars (admittedly only at their old Bicester site), but they always seemed to come up with massively inflated transmission losses, so they actually quote very mediocre ATW power, but then hand you the dyno plot that says you've got some crazy flywheel power readings.... which is what is normally on the graph.
e.g. a stock Mk3 Golf GTI (2.0 8v NA), that should be kicking out 115PS was dyno'd at 138bhp... I had a fairly hefty amount of work done to it as it was "far from fast", they were then quoting 155bhp... it still didn't feel that quick.... I went to another RR session a week later, only to be quoted "115bhp and it is running VERY lean" (the car still felt as fast as it had done when I got it back from AMD)... I took it back to AMD to be checked over and dyno'd again and was told it was all fine and still well over 150bhp. I haven't been back to AMD since, but we eventually found the problems (collapsing vacuum hose and the FPR couldn't cope with the fuelling requirements due to the increased airflow + high lift cams), sorted it out and got it to the point where I was consistently getting it dyno'd at around 150bhp at various other RR's, but it felt like a fundamentally different (MUCH faster) car compared to the "155bhp" car that AMD handed over to me and insisted was a genuine 155bhp.
Note that was all 5-10 yrs ago and at their old site, but it has flavoured my view on them since.