Kirk, not sure I fully understand your thinking so forgive me if I make assumptions that are incorrect.
In my view, once we move away from a strict (well, strict-ish) use of stock hp as the basis for a the process weight, and start trying to come up with a IT power multiplier that incorporates torque then we run into a huge problem: gear ratios and torque under the curve. We then have to start looking at where cars make power and torque and that to me is the beginning of a nightmare.
The stock hp X IT adder X class pwr/weight target seems to work. IT classing should be as simple as possible, and that is simple. I personally would throw out the brakes and suspension adders -- totally subjective and impossible to accurately quantify given what we can do with brakes and suspension -- but leave in the subjective torque adder as a "rough" means of dealing with the legitimate problem Bob identifies above and the FWD subtractor.
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