Change tcp client profile based on iRule

Thank you boneyard, i wan to change the mss value to be 1300 for specific client IP and other client use the assigned tcp profile with it settings

so i searched for irule and applied it, i got +100 Executions but the client is not trying to connect yet, i dont know why i have hits on this irule, maybe because i didnt use (else)

when FLOW_INIT {

       if { [IP::addr [IP::client_addr] equals 10.239.50.50] } {

           TCP::setmss 1300

       }

    }