Nice ! I can see you've spent a few hours there ; >
For all the reasons you stated in your 2nd paragraph BL, I steer my customers toward the safer approach of 500hp or so to the ground then a 650-700 hp figure with the boost cranked up to 30 psi or so for fun at the track.
The tweakier you make the ovearall package the less they tend to actually ENJOY their new toys due to constant tuning and maintenance/repairs :>
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