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Tuner is afraid of high intake air temps (at least on the dyno): 140+ degrees Fahrenheit. He tried to increase boost to 18 or 19 PSI but had to adjust timings. Consequently, the crank hp did not get higher than 370hp. Tuner is afraid to increase boost even more (whilst the car is running on 93 octane). Tuner also says that the hp is higher on the road due to lower intake air temps: 98 degrees Fahrenheit
By contrast, the twinscroll HKS makes almost 450 crank hp @ 17 PSI on the dyno. Seems to be easier to tune. The spool is still good.
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