Priority Groups

Although I agree with Michael, if the application requirement is to persist a returning client, removing the src addr persistence would not the issue. The solution is viable for most scenarios where persistence is not required.

Although there is priority group activation, there are chances of traffic flowing to other pool members in lower priority group.

There is another setting for the priority group activation at the top which shows less than. So in your case if you activate the less than 2. that is when the traffic will stop flowing to the activation group 1. this is way to hard code the traffic flow. Please try and post if that works with you.