Priority Group Activation ( Preemption question)

I have a working config for priority group activation on a 2 node pool.

 

 

Due to the nature of my application I don't want the higher priority pool member to receive traffic when it comes back online, so in essence disable preemption and keep the backup lower priority pool member until we force it back.

 

 

I am assuming this will need to be done via irule, i dont see any settings in GUI that would set this up.

 

 

I guess I need an irule to set the priority lower on the primary member than the backup if it goes down so it doesn't take traffic back when its restored.

 

 

Using persistence would NOT work for our application as users from the same company need to stay on the same pool member and could come from different source IP's.

 

 

 

any help would be appreciated