What do you think the best power/drivability combo is?

FWIW, I'd make the car as light as possible. I don't know what your car is and what it is used for, but weight reduction would be on the to do now list.
I think you'll break it sooner than later, but, a lot as I said is how it is driven. It is the torque that scares me. Hair drier super chargers and turbos act similar via pushing the torque peak higher and higher with higher boost.