I'm also curious about the same things as Fozzy, but also on a few other things.
From what I've read pretty much everyone who uses the Bilstein B8's use them with H&R springs. However because H&R doesn't release their spring rates I'm not too keen on going that path. On the other hand, I haven't found any references to a B8/Swift combo. Is this because it doesn't work at all?
Also, I've been playing around with the spread sheet you posted, but I can't figure out whether I need to enter in damper data or even where to find it as it seems no one has that information for most systems. Also, do we have numbers for the M3 rear sway?