I agree. If I throw the strap over my head onto my opposite shoulder, then the bottle holder is riding right at my elbow. I'm thinking of breaking out the para cord and trying to make a 1-foot (or maybe longer) extension.
I was too lazy to play with the para cord, so bought a SpecOps Accessory strap - it's about 6" or so longer. Not as good as I hoped, but it does drop the bottle holder below my elbow; making it more comfortable when I walk.
What I may do is break out the heavy-duty thread and sew the SpecOps and the Maxpedition straps together...