Maybe this is all off the mark, but a buddy of mine runs a dynapack at an Audi shop here in Denver.
I've seen some pretty sick hp numbers with WAY off torque numbers come from his dyno as well. His explanation was that there is no SAE correction factor for torque numbers, but the HP numbers always get corrected. They dynapack will lay down raw torque numbers on the graph with SAE corrected power numbers and the graph just plain looks silly. Depending on altitude, the gap between the two may be more exaggerated.
I saw a pretty nutty DSM that traps 115 in the 1/4 lay down 425whp and 250ft-lb torque on that exact dyno as a reference.