Hello Aardvark. Why are you not using any kind of wrinkle masks for your models? wouldnt it make them higher quality for faceflex purposes?
Between the fact they're non-trivial to author to look good, and in my opinion add very little for how much work and memory they take, I don't find them worth it. Instead, I use the wrinklemaps for blush flexes - something that is much more obvious, adds an entire dimension of versatility, and is magnitudes easier to author. In my opinion, it's a much more worthwhile use of the wrinklemap system.