I've always been a bit heavy handed for these single point suspension stands. Plus the 76 potentially puts force much further out to the edges...
End result is quite a lot of 'bounce' or 'sway' as you find yourself perhaps pounding out a boogie-woogie or rock and roll piano part. I guess part of it comes from starting on pianos and heavy organs... I simply feel pretty uncomfortable if the keyboard moves even a fraction of an inch..!
I was watching this video and decided to watch the "keyboard stand" also.
https://www.youtube.com/watch?feature=player_embedded&v=tFy3kIYJ4BU#I was thinking about what DIKI wrote above. I was very impressed with the support that stand gave. It never moved........for the first few minutes. Then it gave way as he hit those end keys.
I don't think for a second that the keyboard would go over, but that's got to interfere with your concentration when that bit of movement happens!