I was writing about how those calculations aren't right and your motion ratio calcs looked wrong... until I figured out it was calculations for the swaybar. You forgot that the swaybar is attached to a spring on the other end, not a rigid point. It's essentially transferring spring rate from one side to the other, while absorbing some of that rate in the bar. I'm sure that if I had enough time to spend on it, I could nuke out something that would approximate how it works, but it would be a much bigger spreadsheet and not worth nearly the amount of time it would take.
And I think your calculations are squaring and square-rooting stuff a lot of places they shouldn't. A spring rate of 622 lbs/in with a motion ratio of about 0.5 should result in a wheel rate around 311lbs/in, not 162.
When it comes to swaybars, analysis is generally more work than its worth. Just test it and make sure the car handles ok.
Dave Heinig -
Schumacher Taxi ServicecoROLLa - 2 time loser, RWB MR2 - 5 time loser
The Craptation - IOE WINNER! Lemons South Spring 2010
Crown Vic - Please God Don't Ever Make Me Go Through That Again