I know the flex test is BS but...
...but my used 161.5 Lib Tech T. Rice pro HP is no less flexible than my used 157 NS Proto. Both boards have roughly the same number of days on them.
I only made the comparison after playing with a new 160 Proto HD, and I was thinking how stiff it felt. I thought "that feels as stiff as my T. Rice..." So I checked. The new HD was indeed less flexible. My friends noticed the same thing. I just attributed it to new board vs. used board, but after comparing both used boards... I'm just not sure.
It just kind of threw me for a loop and changed the way I think about board flexibility, because I always used the "stiff" T. Rice for powder days and the "flexy" Proto for everything else.
Something else I noticed, which may be the reason for all this. The Lib seemed to have more rocker/less camber, i.e., when you stand on the back binding, the nose would pop up more.