Fix a Router Configuration with Multiple IPs -- 2

We have a TP Link Archer VR2600 that was configured to allow 5 Internet Static IP's to pass through on to the internet and the router to act as a DHCP for the local network IP range. The ISP is BT (British Telecom UK) The unit has factory reset and lost its configuration. We cannot seem to figure out how to configure the Static Routes/NAT to make this work properly. We do NOT want to use port forwarding as the servers need to use the same ports, each system needs to be exposed similar to the DMZ if you was working with a 1 static. Each system is responsible with its own firewall. We have got it somewhat working but connections in get dropped and the outbound connections are going out on the routers dynamic IP. The servers need to be allowed to accept inbound connections such as VPN, RDP and software specific.