That's a great idea, Carol. Looks very secure indeed.
Like you, I use the Op/Tech straps, and really like them. I don't have any additional security measures where the system connectors attach to the camera, but I do use the velcro
"Secure-Its" where the strap attaches to the system connectors, as I find it difficult to fully trust the click-together Quick Disconnects, no matter how secure they feel
Plus, if I've got anything other than a small prime lens fitted to the camera, I'm in the habit of supporting the weight with my left hand as I walk around. As such, I very rarely have the whole weight of the camera and lens pulling on the strap...