Is my persist record getting ignored?

I think I've figured out how to do it. Before I delete the persist record, I grab the node that the packet would have been sent to. After deleting the record, I force the packet to be sent to that node:

   check if transaction is closed by PUT with ContentLength=0
  if {[HTTP::method] equals "PUT" && [HTTP::header Content-Length] equals "0"} {
    log local0. "[IP::client_addr]:[TCP::client_port], transactionID: $Transaction_ID method: [HTTP::method], length: [HTTP::header Content-Length], deleting existing persist record: [persist lookup uie $Transaction_ID]"
     delete the persist record, then send packet to correct server
    set server_addr [persist lookup uie $Transaction_ID node]
    set server_port [persist lookup uie $Transaction_ID port]
     delete the record
    persist delete uie $Transaction_ID
     send to server
    log local0. "[IP::client_addr]:[TCP::client_port], forwarding transactionID: $Transaction_ID to $server_addr:$server_port"
    node $server_addr $server_port

This seems to do the trick. I think there's still some risk that the same transaction ID could be used by both servers at the same time, but I don't see anyway around that.