You're gonna hate me 4 sure:
How about selling the big turbo, utilise a smaller turbo, lose maybe 100awkw and have a much more driveable car? lol.
Maybe not, but if it isnt driveable (ie if she's a pig at normal traffic speed) as it currently might be with your current setup, then whats the point? Biggest HP means nothing if you cant comfortably drive the car in traffic.
.............. although I know sweet-FA so ignore my comments But something to think about.
EDIT: Or install an Automatic gearbox with a highish RPM stall converter, maybe?