I also just noticed that the correction factor (CF) is STD, not SAE. STD always reads higher then STD (they use a different formula for correction). SAE is the more widely 'accepted' number, knowing STD reads higher.
See my dynos below. Same graph, one using CF: SAE, the other with STD.
SAE - 404.65rwhp
STD - 412.69rwhp.
So now to apply that to your dyno. SAE reads about 2% lower then STD. 2% lower on your dyno, will put your power at 369.46rwhp. Take that, add 12% drive loss, and you are sitting at 413.8bhp. Almost dead on with what it should be.
2011 GT Prem - 400a, Brembo Pkg, 3.55s, 6spd
OLD 405rwhp/381rwtq - 12.71 @ 113.13mph, 2.099 60' on stock tires (DA corrected 12.3 @ 116mph)
Mods: Boss 302 bottom end, JPC Stage 1 heads, Boss 302 Manifold/Oil Cooler/Front Fascia/Rear Diffuser, Mishimoto Radiator, Spec Clutch/Flywheel, Airaid CAI, JBA Long Tubes, Pypes Super System, Eibach Pro-Kit, UMI LCA/Relo Brackets/Panhard Bar, GT500 wheels/Nitto NT555 (255/45 F, 285/40 R), Barton Shifter/Bracket, SGII /w blendmount, V1