Session Persistence when pool disabled

I have configured a VIP with a default pool containing 2 servers.

Action on service down has been configured as RESET.

I have a monitor applied which retrieves a file that contains the word SUCCESSFUL or FAILED.

The receive disable string is FAILED.

This is working as expected.

I also have an irule for jession id persistence taken from here:

    https://devcentral.f5.com/wiki/iRules.Weblogic_JSessionID_Persistence.ashx
`

The problem is that the persistence is being honoured so that even if pool member is DISABLED the existing connection is not RESET.

Pool config is:

`    ltm pool /DEVT/pool-extranet-devt-https {
members {
    /Common/172.1.1.1:443 {
        address 172.1.1.1
    }
    /Common/172.1.1.2:443 {
        address 172.1.1.2
    }
}
monitor /DEVT/monitor-extranet-devt-10500 and /DEVT/monitor-extranet-devt-443 
service-down-action reset
    }
`

Monitor config is:

`    ltm monitor https /DEVT/monitor-extranet-devt-443 {
adaptive disabled
cipherlist DEFAULT:+SHA:+3DES:+kEDH
compatibility enabled
defaults-from /Common/https
destination *:*
interval 5
ip-dscp 0
recv "200 OK"
send "GET / HTTP/1.1\\r\\nHost: \\r\\n\\Connection: Close\\r\\n\\r\\n"
time-until-up 0
timeout 16
    }
    ltm monitor http /DEVT/monitor-extranet-devt-10500 {
adaptive disabled
defaults-from /Common/http
destination *:10500
interval 5
ip-dscp 0
recv SUCCESSFUL
recv-disable FAILED
send "GET /jbtest/servlet/JBTest HTTP/1.1\\r\\nHost: \\r\\n\\Connection: Close\\r\\n\\r\\n"
time-until-up 0
timeout 16
    }
`

Virtual Server config is:

`      ltm virtual /DEVT/vs-extranet-devt-https {
destination /DEVT/172.28.152.30:443
ip-protocol tcp
mask 255.255.255.255
persist {
    /DEVT/profile-persistence-devt-jsessionid {
        default yes
    }
}
pool /DEVT/pool-extranet-devt-https
profiles {
    /Common/http { }
    /Common/httpcompression { }
    /Common/oneconnect { }
    /Common/tcp { }
    /DEVT/profile-extranet-devt-clientssl {
        context clientside
    }
    /DEVT/profile-extranet-devt-serverssl {
        context serverside
    }
}
source 0.0.0.0/0
source-address-translation {
    type automap
}
translate-address enabled
translate-port enabled
    }               
`

So how can I get BIG-IP to reset any persistent connections when server  responds with FAILED?

I was going to apply an iRule that would reject connections   if both pool members were down:

` when HTTP_REQUEST {
 if { [active_members pool-extranet-devt-https] < 1 } {
  reject
}
    }

I would like to do this for each pool member though.

Anyone got any thoughts as to how i could do this ?

Or even why the ACTION ON SERVICE DOWN doesn't work when persistnce is applied?