So here is an idea, I’ve been doing some digging and found from looking at a ton of the forums out there that everyone always struggles with flickering vegetation and elements in VUE scenes. I’ve had scenes before that don’t flicker, but then other times it seems to “feel” like being difficult and icannot get rid of it. Especially when running Xtream through Max 9. So if you feel so inclined maybe post up your render settings and tips and tricks you have learned. 
-I seem to have fairly good luck resorting to the default “broadcast” setting that usually takes care of most of the nastiness, but there are the certain few occassions where I jst can’t get a good quality image without getting my ass kicked come rendering time.