Smoothing Picker Layer for eyes and eyelids

Hello, 

I want some advices. 

I created a puppet and i'm trying to reproduce this effect  https://tenor.com/ryUsIyoRKfg.gif 

i can't share my puppet for NDA reasons.

So i create a file for the lid with the eyelid top that have mutiple layers and the behavior Picker Layer with the camere input for the eyelid openning 

and for the pupil i did something pretty similaire to, with the lights with some dangles, i like it pretty much but it's not smooth at all, we clearly see the differents layers. 

I want to know if i can smooth the mouvement ?

I try with more layers, it's not working. Maybe i think i have some problem to understand clearly how works the index and the percentage. 

Is it possible to have something similar but with a transformation behavior directly ?