All I can tell you is that I am a bracket racer, so small increases in power and small increases/decreases in weight sometimes make a huge difference and sometimes don't. There are so many other factors that your "8th grade" math isn't taking into consideration. I think that its great that you have formulas worked out, but unfortunately there is much more to it than that. I don't use hp numbers to calculate anything which is the biggest mistake you can make. Especially manufacturer provided numbers. Weather, track conditions, track temp, wind, etc etc etc, are the only real numbers that matter. You don't race a computer or a calculater.
