So resolved the issue, the Ethernet ports are numbered in reverse, so port 4 on the physical device is actually port 1 on LuCi interface. So all is well. Managed to setup my Vlan in bridge mode correctly and gets the new dhcp assigned correctly
Hi, I dont have access to the ports at the moment, but followed this tutorial. Instead of adding it to the wireless card, I went to "switch" section and added a new VLAN where CPU1 was tagged (as it needs to be tagged on all VLANS, and then made 1 untagged and the rest off. You will need to update the previous VLAN entry to "off" for the port you are using in the new VLAN as you cant have a port assigned untagged on multiple VLAN entries.