My personal rules are no less than 50% for anything complex like a set or courier. On single items, I'd probably go down to 30% depending on the complexity.
I played with the renders some and if you drop the saturation on the red channel by 35 and the yellow by 50 it looks allot better/more human less living orange.
So Grow-FX is on 50% and i'm thinking of buying it. It looks to be one of the best high-poly vegetation makers out here. Anyone have experience with it?