I don't have answers really, but just my two cents as i am just about to get into facial retraining.
My FT said that synkinesis is "quite common" where there has been damage to the facial nerve (indicated by palsy). That made me feel a little better as i was hoping to avoid it, thinking i had avoided it. I am now just over 11.5 months post op.
He said the mild synkenisis i have indicates that the muscles are working inefficiently, that that retraining can help, but it is not an easy thing to correct and takes practice and patience. I will be going back in 2 weeks for some stimulation therapy and to get exercises to correct my problem areas (really just eye "smiling" i.e. like squinting a bit, when i smile with my mouth. the right eye does not do the same thing). He suggested it is good to tap and gently massage the face (circular) motions, throughout the day to relieve over active, hyper muscles.
I don't know if this stuff gets better or worse with time (and no active intervention) so i am going for it... hoping that i can retrain enough to make things work a bit better.
Good luck to you!
Trish