Setup BigIP F5 VE 25mbps Good in an AWS VPC

Coming back with some more details. I've managed to get past the uninitialized interface and have mostly been following this guide: https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/bigip-ve-setup-amazon-ec2-12-0-0/2.html

However, when I connect to the Elastic IP bound to the second IP on the third network interface, the one used for the Virtual Server's external IP, the connection is reset.

tcpdump shows me something like this when trying to connect to the Elastic IP: PortN:

AWS private IP used by external interface:PortN > web server IP:TotallyRandomPort (instead of PortN). I don't think this is normal and from what I can see everything is configured correctly regarding the ports, I can't see this random port number anywhere in the web UI. (nevermind, I think it's the port from the already established TCP connection to the backend, I think...; still overall there's no connection through Bigip)

Any ideas/tips for troubleshooting?