Regarding Consistency in animation: Here's a test animation using Redshift's new Volume Displacement to add fine detail to a procedural cloud made with C4D's Volume Builder. I'm quite pleased with the outcome!
I uploaded the project file here, so you can play around with different noises, etc:
1309818867_ProzeduraleVolume-Builder-WolkemitRS-Volume-Displacement_LY01.mp4