I have the same type of problem but just the opposite. My elbow tends to stick too close to my body and my stroke goes from inside out causing me to miss shot after shot and not be able to figure out why. Then I remember that my elbow has to be away from my body and immediately the shots start splitting the pocket.
I have to incorporate a method into my pre-shot routine that includes setting up with the elbow in the proper position and I was doing that until I didn't pick up a cue from Feb thru last week.
7 month lay off! Stupid.