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Gas quality makes a huge difference at any rpm! Especially when you compare ethanol mix gas vs. pure gas. It affects how much timing you can put in at, which effects just how fast it's going to spool up.
But concentrating on that ignores another factor - it's different dyno's. Not different as in different locations/temps, different in that the dyno we use in Japan, a Dynopack, is far more accurate with load than a Mustang dyno, the dyno used in our american run. And the amount of load will directly impact that spool speed. If you look at the Perrin thread, you'll notice they are using a dynopack as well.
On the road, the car would hit peak boost - easily - at 2500rpm in 4th through 6th gear. Even on 91 ethanol-blend octane. That's why we are not worried about a smaller turbo, it's plenty fine at the size it is.
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