c4d effect renders set to different layer modes and blended in, sometimes if you motion blur all the c4d and the background you can get some more flow as well, and one of the hardest part of any graphic design project is that it is almost never for you, its not your aesthetic's that you are trying to please. I know I am a noob at making avi's and you probably don't want me of all the artists to be telling you what you can do, but perhaps less contrast? all of your avis seem to have a high level of contrast that is kind of bringing the quality down. And a few color correction overlays can be helpful as well.
I am not trying to mean and I'm not saying they are terrible.