Inline F5 not working

I agree that a forwarding virtual server is a good fit for allowing your backend servers access out to Internet resources for updates, browsing, etc. I assume this access is working as intended?

If you intend to use load balancing, a different type of virtual server might suit you best. In the absence of any special requirements, a standard type should suffice. Ensure you are allow port and address translation on your virtual server.

For administrator access to servers, I'm unsure why you'd be using load balancing in this case. Or why you'd put F5 in that path to begin with.