ktstyle,
i am also running Checkpoint Gaia ClusterXL VMAC with F5 v10. In SOL9487, F5 details VRRP which Gaia also supports. VMAC sets up ClusterXL to work like VRRP from a virtual mac & IP architecture. The VRRP iRule example in SOL9487 can also be applied to ClusterXL when running VMAC. If you are running F5 v11, the SOL article specifies to disable auto last hop but i have not way to test the iRule functionality in v11. I am running this iRule in v10 and it resolved my issues with my network monitors and long-term connections being dropped due to a firewall failover.