Appreciate all of the responses very much, v-verb I respectfully disagree about modifying the racquet. It might help marginally however it would be at an unwanted cost.
My physio e-mailed me from my home state in Ohio and he suggested using the racquet until I reach a fatigue point, and then going back to the regular APD. He also suggested strengthening rotator cuff, scapula, and overall shoulder using exercises at the gym.
To be fair, I never work-out in the gym which is why I'm probably a 5.0 and not any higher. All I do is running for my conditioning.
Any other thoughts, please feel free to write.