Load Balancing based off TCP Payload entity

Hello,

I believe I constructed an irule to properly a variable from text captured from two distinct points in the TCP Payload but I am not 100% certain the Irule will is persisting off this entity. can someone take a look below and see if this looks correct? I added the message load balancing profile on as well.

The expectations are tat after collecting tcp payload for a new connection search for a string and then persists that string to a certain pool ( contains 2 servers). all subsequent matches for that same string in payload need to go to that pool. I also want the pool to load balance diverse entities so not everything is on the same pool member. Does this look correct ?

when CLIENT_ACCEPTED {
  TCP::collect 
}

when CLIENT_DATA {
   set payload [TCP::payload]
   set entityID [findstr $payload "@"  1 ","]
   log local0. "$entityID: $entityID"
   pool XYZ
   persist uie $entityID
   log local4.info " Entity Session routing $entityID and setting persistence"
      TCP::release
      TCP::notify request
}