Steve,

After peering over your charts, I think you are falling victim to our collective enemy - HEAT.

The numbers a off a bit, but it's not as bad as i believe you think.

Even with the dyno fan, it is very difficult to replicate real-world airflow.

Your bigger pulley is already straining the limits of the OEM heat exchanger....time for bigger.

The car is definitely pulling some timing and dumping fuel top-end.....how much? Only datalogging will tell.

A bigger HE + a bit of tweaking to your tune should net great results, IMO.