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Two things I'll mention:
1. Good work!
2. There's more to understeer/oversteer balance than just the main spring rates. This car is very bumpstop active, so lowering an inch up front with soft rates means you're getting a LOT of spring rate from the bumpstop itself. So the rates on the springs are almost secondary once you're in a corner and the body is rolling...the spring rate of the stock bumpstops gets progressively very firm. So lowering 1 inch with the same spring rates as stock will definitely change the handling (and ride) of the car. Even lowering with the same % increase in rate front and rear can change balance. Maybe simply
Suspension geometry is also a factor and you did note this fact in the spreadsheet.. Lowering an inch up front has a different effect on geometry than lowering an inch in the rear. Maybe mention the bumpstop thing too and/or change the wording (the 2 examples especially...putting a number on how much % more/less understeer there is than stock is very tricky). You could say the change the spring rate bias X% or something.
I would also note which springs include replacement bumpstops (our RCE springs and Eibach).
- Andy
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