Nice . superb work.
I make calculation as well on excel just for the springs but one thing I noticed is to take into account the unsprung weight (the wheel+tire and half the cvd/arm/camber link).
In 1/10th 2wd cars I discovered that on my b5m the rear is then lighter by 193gr and the front by 151gr (42gr bias). 320gr of the 1550gr car is unsprung to my surprise it's quite a lot!