There’s actually a much easier way to achieve this. I ended up searching for the answer myself, but realized there’s a SIMPLE way to do this. And like me, I’m sure you’ll feel really stupid when I tell you how to do it. 🙂
Just create a null object, add a Slider Control Effect from the Expression Controls, and link the middle wiggle value to that slider. Then just keyframe the amount of movement you want with the Slider Control and adjust your keyframes from there. Depending on your naming of the layers, the wiggle code will looks something like this:
wiggle(2,thisComp.layer(“Null 1”).effect(“Slider Control”)(“Slider”),1)