People have been complaining about the grain, noise, and flicker of vue for e-ons!

There is no hope.

People at e-on say vue 7 renders faster than vue 6 (they even use it as a selling point) but the truth is the render settings are lower thus render speed increase.  Truth be told vue 7 renders slower at the same settings than vue 6 at the same quality.

Compositing in AE is the best way around the known vue short-comings.