I have lots of already recorded body and face mocap. The face mocap is animating CC4 Kevin's full face, including mouth.

I want to use 100% of the expressiveness of the facial performance BUT I want to blend 50% of the lips performance with 50% of the AccuLips viseme performance. If I just play with the Viseme / Expression strength sliders, they affect the WHOLE facial performance, resulting in me losing the eyes and eyebrow expressiveness. 

I don't know how to either
1) EDIT the curves of the facial mocap so I can smooth / reduce keyframes on the LIPS/MOUTH ONLY
2) Mask out the Expressiveness setting so that I can have 100% expressiveness of the eyebrows but 50% on the lips.

I know I can replace/rerecord a facial mocap performance, but I used real actors and I need to preserve their performances.

Any thoughts?