I'm by no way an expert in all load balancing topics, but I'm pretty sure if your using a f5 gtm for loadbalancing between the sites, wouldn't the least connections method work. I know enough to have our cloud pod working, we just do a production and dr pod, which we use global availablity. I'm wondering if this was set the gtm would split the user requests between the pods. I assume netscaler and other methods would probably have something similar.