I no longer have the Boeing equivalent of the POH for the -400 with me, it has been a few years since I flew them, but I seem to remember it had a diagram showing the roll and pitch angles and oleo compressions for particular pod strikes.
What struck me at the time and is apparent here is that at a certain roll angle and nose down pitch (7 and 3 degrees?, my memory fails me) it was the inboard pods that struck before the outboards with full oleo compression. The rate of descent for full oleo compression was not stated but would have been near the limit, around 600fpm.