Its workable with the current regulations as red bull seem to have a pretty acceptable ride and with top performance.
After seeing the underside of redbull Vs Ferrari after the Monaco qualy crash. The redbull is just more developed.
Like i said above, they just seem to have been "luckier" than others in that the natural frequency of the chassis does not coincide with the frequency of the suspension loading unloading as the floor stalls.
"luckier" might be luck, or more likely the greater knowledge and experience of Newey from his years in sports cars and other formulae with ground effect in the past.