if you want it variably controlled, I don’t see why a linear wouldn’t work.
//paste in direction and slider will control balance between 2 nulls.
s = effect(“Slider Control”)(“Slider”);
x=thisComp.layer(“Null 1”).transform.position;
y=thisComp.layer(“Null 2”).transform.position;
n1=x[0];
n2=x[1];
n3=y[0];
n4=y[1];
s1=linear(s, 0,100, n1, n3);
s2=linear(s, 0,100, n2, n4);
[s1,s2];
//you can also add wiggle in slider if you want.
https://technicolorsoftware.hostzi.com/