I had to keep 172.27.2.1 on the vlan interface, it's the gateway for the network.
I found a solution along those lines though, I set up an unnumbered address statement to reference the VLAN IP, and it seems to work just fine.
I now have proxy-dns working and can move on to radius authentication.
Thank you all for your help.
lo0 { unit 0 { family inet { unnumbered-address vlan.10; } } }