Idle timeout on OWA https session

Hi, We are in the process of migrating outlook connectivity from LTM v10.2.4 to LTM v11.6.0. One issue we have seen is that OWA sessions through the new virtual server are timing out at 3-5mins. i have compared configurations and can not find any discrepancies so I am wondering if there has been a default between versions which needs to be checked? I have checked some other Dev central blogs and I see some other users with similar issues but I look to have any workarounds in place. here is my irule setting for /owa

        "/owa*" {
         Outlook Web Access
        if { [HTTP::header exists "APM_session"] } {
            persist uie [HTTP::header "APM_session"] 7200
        } else {
            persist cookie insert
        }
        pool outlookeu-owa_pool
        return
        }

here is my persistance profile output ltm persistence cookie outlookeu_persist_profile { app-service none defaults-from cookie timeout 0

My tcp profile idle timeout is also set to 3900 seconds.

Any other idea's?