@Sketch
I don't think it would have been possible to notice the nPS in Vanilla Brawl. I mean, it had so little shieldstun that you wouldn't really have been able to notice a reduction. Would've been like trying to feel the difference between 1 C and 3 C degrees.
I realize now that the reason why a lot of previous values seemed like too little compared to 3/5 was because I nPS'd without realizing it, since I had no idea it existed. That always made it seem like the shieldstun was too little.
EDIT:
Come to think of it, remember this post I made?
One interesting thing I noticed:
While testing ROB's Fsmash at 1/4 speed against King Dedede, I would mash the A button as Dedede right after the shield got hit. What I noticed was that there is a very very small window that lets you shieldgrab right after the shield gets hit by the Fsmash, nullifying the shieldstun. In all cases where I pulled that off, the timing was very hard and could only be pulled off at 1/4 speeds. I never succeeded at pulling it off at 1x speed and I would be surprised if anyone could do it with any degree of consistency.
If you missed that window, you could not shieldgrab until the proper shieldstun amount was over. At 1x speed, this is what always happens.
If you nailed the window, you would still get pushed by the attack and would shieldgrab while you're still sliding. Whether or not the slide caused you to miss the grab or not would depend on distance from the attacker.
Looks that that was the nPS all along.
It had nothing to do with how soon after the hit you tried to grab, but instead with how soon before the hit you shielded!
Man! When I think back to all my testing, the nPS really screwed me up royally! So many values seemed too short... oh man...
I hope everyone has read all this and is aware of the nPS, because it's extremely important to remember it when you are doing your own shieldstun value testing.
Ignore it and you'll get a bunch of inaccurate data because you nPS'd and thought the stun was too little.
Speaking from experience... *>.<