They compress fully. They're there to soften the impact of full compression.

That's physically impossible unless the pad compresses to zero height. I felt one last week, it's soft and squishy, but there is no way it just disappears under compression.

Has anybody else broken Bilsteins? I've just heard of it happening on your truck.

Not yet, drive a little harder

I am running polyurethane bumpstops, but they are taller than the ones SLR ships with the lift kit.

Math is math, the Bilsteins are shorter than the stock shocks by a long shot.

No shock should use up all of it's travel ever, it should always have room left at both ends of the stroke.