Yes. But this time I encoded the last two clips at 10mbps; hence, maybe you could note less grain, if this is the problem... i've done it to upload (and let you download) clip faster, as I think I reached a good result with grain, but still not sure which saturation setting I should use.
So, focus first on the saturation; then, if the last setting is good, I could make another test clip, this time using an high bitrate setting - 25/30mbps, that will be used for the final release.