Joel,
I think that 306rwkw run is with the stock cams, it made 312rwkw with the cams in. Also i always had a 3" exhaust, was meaning to upgrade to 3.5" but never got around to it.
Any way you can plot Stockys twincharge graph on the graph with ours?, maybe work out RPM and gearing of his car compared to speed of our R32 gts.