I think we're heading down the wrong direction personally when we're getting into the "high power & FWD does work, ish" territory. Yes, the Focus RS just about works but if you compare it back to back with rear wheel drive or four wheel drive you soon realise why nobody in the performance car business uses front wheel drive. You're fighting basic physics, and you're never, ever going to get to the place where traction on the driving wheels increases with more torque applied so long as you've got front wheel drive.
The absolute best you can hope for with front wheel drive is that it doesn't torque steer and tramline.
Try comparing the Focus RS to the Audi TTS which is heavier, less powerful and has higher drivetrain losses with 4wd. The TTS has the same 0-60 time. An additional 50bhp in the Focus RS 500 only knocked another 0.3 seconds off the 0-60 time.
With FWD your power is always working against you and not with you, which is why FWD always has been, and always will be the domain of the city hatchback and not high powered sports cars.