If both lock-downs will hold the sight on their own, then why not use just one? How about tightening one just enough to keep it stationary, but loose enough to move it with your thumb/finger as an animal approaches? I have an HHA on my Mathews MQ1. It only has a single lock-down, but I never tighten it completely. I use it as I described and it works flawlessly.

Just my 2 coins.